Conroe Buying Guide: Feeding the Monster
by Gary Key & Wesley Fink on July 19, 2006 6:20 AM EST- Posted in
- Motherboards
ASUS P5W-DH Deluxe
Basic Features
Current thinking in overclocking options is to provide very fine adjustments for voltages over a very wide range of control - particularly in the memory voltage control. ASUS has done this on other recent boards, like the AM2-based M2N32-SLI Deluxe. However, the P5W-DH only extends to 2.4V compared to the 2.5V on the M2N32-SLI and granularity of the adjustments is a pretty coarse 0.5V compared to 0.2V on the M2N32-SLIl. We suspect this is because the P5W-DH is mainly a refresh to the existing ASUS P5WD2-E, which we reviewed at ASUS P5WD2-E Premium: Intel 975X for the Enthusiast when it was introduced in January.
As you will see below, overclocking was outstanding, but we suspect that higher voltage adjustments on the MCH would allow even higher overclocks. The ASUS stops at 1.65V, while the Intel BadAxe goes on to 1.725V. We would welcome ASUS raising the top voltage on the MCH. There are reports that modding the ASUS to reach 1.9V MCH allows FSB overclocks to almost 500 instead of the current limit of around 440 to 450 FSB.
If you compare the new board to the earlier P5WD2-E you will find the board is basicly the same. The storage controllers have been changed to a Silicon Image that allows a port-multiplier type connect to one of the ICH7 ports. This allows driverless RAID. The board has also dropped the PCIe x4 slot. Asus also replaced the Marvel SATA/PATA controller with the updated JMicron chip. In general. though, our comments in the P5WD2-E review still accurately describe the board's strengths and weaknesses.
The P5W-DH Deluxe adds the lower voltages required by Core 2 Duo and meets the voltage stability requirements for Conroe. Both of these factors are why almost all existing Socket 775 boards cannot handle Core 2 Duo. Both a BIOS and a hardware change are required for proper operation with Conroe.
Basic Performance
All-in-all the ASUS P5W-DH Deluxe is one of the best Conroe boards we have tested. The 975X chipset is definitely more mature than current P965 chipset motherboards. Having said that, there were still several BIOS revisions during our testing to update certain peculiarities in the current steppings of Core 2 Duo.
The ASUS board was every bit as stable with Core 2 Duo as the Intel BadAxe, which for a long time was the only board that would operate with Conroe. The ASUS also implements the ability to adjust X6800 (2.93EE) ratios both up and down, which is a feature of this processor, but is not supported on all boards. The ASUS overclocks further than any other stock board we tested, and it recovers from bad overclocks gracefully. If the OC is close a reboot will usually allow further adjustment. If the OC is far off you need to physically turn off the power then restart to further adjust the BIOS. This is a much more friendly board for OC than the Intel BadAxe, for instance, that will not recover from any failed OC without a full power down and sometimes a CMOS clear.
The ASUS P5W-DH Deluxe also fully supports dual X8 CrossFire. The Enthusiast wanting to overclock Conroe as far as possible or anyone wanting to run ATI multi-GPU on an Intel chipset will be very happy with the P5W-DH. We liked the board enough that it became our new standard board for our DDR2 memory testing platform.
Overclocking
The decision was reached to evaluate motherboards with the E6700 (2.67) processor, as it represents the mid-range of Conroe pricing. Of course, all Conroe processors except for the top X6800 are multiplier locked, which limits options in overclocking. Like Socket 478 that does not appear a huge handicap, since the stock E6700 reached a 50% overclock at 4.0 GHz. Our new OC test bed uses an excellent air cooler in the Tuniq Tower, and you are likely to experience lower overclocks with stock cooling.
The ASUS P5W-DH also reached 4.0GHz with an X6800 (stock 266 x15 at 1.575V) and an E6600 at 445FSB x 9x multiplier. All of these results are outstanding, representing overclocks at stock ratio as high as 67%.
With the wide range of adjustable memory ratios and voltages, memory was set to end up somewhere around DDR2-800 3-3-3-9 at 2.2V. This is really easy with the ASUS P5W-DH BIOS, since the BIOS shows the resulting memory speed when you adjust the FSB speed. This means you don't have to calculate the resulting memory speed when trying to set up a rational overclock, which is a really convenient feature for most enthusiasts.
Overclocking is always dependent on the chip you have and the capabilities of the motherboard. Processors vary in their OC abilities, and OC is never a given. However, we are confident that wherever you can go with your CPU it is not likely the ASUS P5W-DH Deluxe will be holding back your overclocking efforts.
Basic Features
| ASUS P5W-DH Deluxe | |
| Market Segment | High-End/Enthusiast |
| CPU Interface | Socket T (Socket 775) |
| Chipset | Intel 975X + ICH7R |
| CPU Support | Core 2 Duo, Pentium D, Celeron D, Pentium XE, LGA-775 based Pentium 4 |
| Thermal Design | 8-phase power Fan-less Heatpipe Cooling ASUS Stack Cool for OC |
| Default Bus Speed | 1066 (533/266) |
| Bus Speeds | 100 to 500 in 1MHz Increments |
| Memory Speeds | DDR2 at Auto,400,533,667,711,800,889,1067 |
| PCIe Speeds | Auto, 90 to 150 in 1MHz Increments |
| Performance Mode | Auto, Standard Turbo |
| AI Overclocking | Manual, Auto, Overclock Profile, AI N.O.S. |
| PCI | Auto, 33.3, To CPU |
| Core Voltage | Auto, 1.225V (Actual CPU voltage) to 1.7000V in 0.0125V increments |
| FSB Termination Voltage | Auto, 1.2v, 1.3v, 1.4v, 1.5v |
| MCH (Memory Controller Hub) Voltage | Auto, 1.50v, 1.55v, 1.60v, 1.65v |
| ICH (SB) Voltage | Auto, 1.05v, 1.20v |
| PEG Link Mode | Auto, Slow, Normal, Fast, Faster |
| CPU Clock Multiplier | Auto, 4x-25x in 1X increments |
| DRAM Voltage | Auto, 1.8V to 2.4V in .05v increments |
| DRAM Timing Control | 9 Options |
| Hyper Path 3 | Auto, Disabled, Enabled |
| Multi-GPU Option | CrossFire (2 X8 PCIe) |
| Memory Slots | Four 240-pin DDR2 DIMM Slots Dual-Channel Configuration Unbuffered ECC/non ECC Memory to 8GB Total Intel MPT (Memory Pipeline Technology) ASUS HyperPath3 |
| Expansion Slots | 2 PCIe X16 2 PCIe X1 3 PCI Slots |
| Onboard SATA/RAID | 3 SATA2 3Gb/s Drives by Intel ICH7R (RAID 0,1,5) PLUS 2 SATA2 3 Gb/s Drives by JMicronJMB363 (RAID 0,1) (1 internal,1 external) PLUS 2 SATA2 3 Gb/s Drives by Sil4723 (supports RAID 10 by combining iCH7R drives with Sil4723 drives) TOTAL - 7 Sata2 3Gb/s drives |
| Onboard IDE/IDE RAID | One Standard ATA133/100/66 (2 drives) by JMicron JMB363 |
| Onboard USB 2.0/IEEE-1394 | 8 USB 2.0 ports supported by ICH7R 2 Firewire 1394a by TI |
| Onboard LAN | DUAL PCIe Gigabit by Marvel 88E8053 for AI Net2, PLUS WiFi 54Mbps supporting 802.11g |
| Onboard Audio | Azalia HD Audio by Realtek ALC882M 8 channel codec Supports Dolby Master Studio including Dolby Digital Live |
| Power Connectors | 24-pin ATX 4-pin EATX 12V |
| Back Panel I/O Ports | 1 x PS/2 Keyboard 1 x PS/2 Mouse 1 x Serial 1 x Audio I/O Panel (6 plug programmable) 1 x Optical S/PDIF Out Port 1 x Coaxial S/PDIF Out Port 1 x IEEE 1394a Firewire 1 x External SATA2 2 x RJ45 LAN 1 x Wireless LAN antenna 4 x USB |
| BIOS Revision | AMI 701 - July 8, 2006 |
Current thinking in overclocking options is to provide very fine adjustments for voltages over a very wide range of control - particularly in the memory voltage control. ASUS has done this on other recent boards, like the AM2-based M2N32-SLI Deluxe. However, the P5W-DH only extends to 2.4V compared to the 2.5V on the M2N32-SLI and granularity of the adjustments is a pretty coarse 0.5V compared to 0.2V on the M2N32-SLIl. We suspect this is because the P5W-DH is mainly a refresh to the existing ASUS P5WD2-E, which we reviewed at ASUS P5WD2-E Premium: Intel 975X for the Enthusiast when it was introduced in January.
 |
| Click to enlarge |
As you will see below, overclocking was outstanding, but we suspect that higher voltage adjustments on the MCH would allow even higher overclocks. The ASUS stops at 1.65V, while the Intel BadAxe goes on to 1.725V. We would welcome ASUS raising the top voltage on the MCH. There are reports that modding the ASUS to reach 1.9V MCH allows FSB overclocks to almost 500 instead of the current limit of around 440 to 450 FSB.
If you compare the new board to the earlier P5WD2-E you will find the board is basicly the same. The storage controllers have been changed to a Silicon Image that allows a port-multiplier type connect to one of the ICH7 ports. This allows driverless RAID. The board has also dropped the PCIe x4 slot. Asus also replaced the Marvel SATA/PATA controller with the updated JMicron chip. In general. though, our comments in the P5WD2-E review still accurately describe the board's strengths and weaknesses.
The P5W-DH Deluxe adds the lower voltages required by Core 2 Duo and meets the voltage stability requirements for Conroe. Both of these factors are why almost all existing Socket 775 boards cannot handle Core 2 Duo. Both a BIOS and a hardware change are required for proper operation with Conroe.
Basic Performance
All-in-all the ASUS P5W-DH Deluxe is one of the best Conroe boards we have tested. The 975X chipset is definitely more mature than current P965 chipset motherboards. Having said that, there were still several BIOS revisions during our testing to update certain peculiarities in the current steppings of Core 2 Duo.
The ASUS board was every bit as stable with Core 2 Duo as the Intel BadAxe, which for a long time was the only board that would operate with Conroe. The ASUS also implements the ability to adjust X6800 (2.93EE) ratios both up and down, which is a feature of this processor, but is not supported on all boards. The ASUS overclocks further than any other stock board we tested, and it recovers from bad overclocks gracefully. If the OC is close a reboot will usually allow further adjustment. If the OC is far off you need to physically turn off the power then restart to further adjust the BIOS. This is a much more friendly board for OC than the Intel BadAxe, for instance, that will not recover from any failed OC without a full power down and sometimes a CMOS clear.
The ASUS P5W-DH Deluxe also fully supports dual X8 CrossFire. The Enthusiast wanting to overclock Conroe as far as possible or anyone wanting to run ATI multi-GPU on an Intel chipset will be very happy with the P5W-DH. We liked the board enough that it became our new standard board for our DDR2 memory testing platform.
Overclocking
| ASUS P5W-DH Deluxe Overclocking Testbed |
|
| Processor: | Intel Core 2 Duo E6700 Dual Core, 2.67GHz, 4MB Unified Cache 1066FSB, 10x Multiplier |
| CPU Voltage: | 1.525V (default 1.2V) |
| Cooling: | Tuniq Tower 120 Air Cooling |
| Power Supply: | OCZ GameXstream 700W |
| Memory: | Corsair Twin2X2048-PC2-8500C5 (2x1GB) (Micron Memory Chips) |
| Hard Drive | Hitachi 250GB 7200RPM SATA2 16MB Cache |
| Maximum OC: (Standard Ratio) |
400x10 4000MHz (+50%) |
The decision was reached to evaluate motherboards with the E6700 (2.67) processor, as it represents the mid-range of Conroe pricing. Of course, all Conroe processors except for the top X6800 are multiplier locked, which limits options in overclocking. Like Socket 478 that does not appear a huge handicap, since the stock E6700 reached a 50% overclock at 4.0 GHz. Our new OC test bed uses an excellent air cooler in the Tuniq Tower, and you are likely to experience lower overclocks with stock cooling.
The ASUS P5W-DH also reached 4.0GHz with an X6800 (stock 266 x15 at 1.575V) and an E6600 at 445FSB x 9x multiplier. All of these results are outstanding, representing overclocks at stock ratio as high as 67%.
With the wide range of adjustable memory ratios and voltages, memory was set to end up somewhere around DDR2-800 3-3-3-9 at 2.2V. This is really easy with the ASUS P5W-DH BIOS, since the BIOS shows the resulting memory speed when you adjust the FSB speed. This means you don't have to calculate the resulting memory speed when trying to set up a rational overclock, which is a really convenient feature for most enthusiasts.
Overclocking is always dependent on the chip you have and the capabilities of the motherboard. Processors vary in their OC abilities, and OC is never a given. However, we are confident that wherever you can go with your CPU it is not likely the ASUS P5W-DH Deluxe will be holding back your overclocking efforts.
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123 Comments
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Beaner - Wednesday, July 19, 2006 - link
Very well-written article guys!Thanks for taking the time to enlighten us all.
Just wanted to point out that the Mushkin Redline sticks can be had right now for $355 AR. At that price, I may just have to grab 'em myself!
ChronoReverse - Wednesday, July 19, 2006 - link
It was pretty much shown that the effect of using memory dividers for Athlon64's was rather minimal while most dividers were more adverse for Netburst.How large of an effect does using memory dividers have on the Conroe?
Wesley Fink - Wednesday, July 19, 2006 - link
The effect of memory dividers is much smaller on Conroe than we saw on Netburst. In fact memory dividers on Conroe behave more like AM2 - probably the result of the "apparent" reduction in latency with the intelligent look-ahead in memory. Core 2 Duo is not Hyper-Transport, so 1:1 (533) tis still theoretically the highest performing setting, but we were hard pressed to find any measurable advantage of 1:1 in most situations.We had tested a number of high-performance dimms on Conroe before we wrote the Buyers Guide, but there just wasn't the time - or room - to include full memory performance data in the Guide. We do have memory reviews in process that will provide specifics to your questions.
We can summarize what we have learned about memory on Conroe so far. DDR2-667 is quite a bit higher in real perfomance than DDR2-400 or DDR2-533 (1:1). We would consider DDR2 to be the minimum memory that should be used with Conroe. Going up from DDR2-667 we found the following - from fastest to DDR2-667. DDR2-1067 4-4-4 is a bit faster than DDR2-800 3-3-3 is a bit faster than DDR2-667 3-2-3. Timings are very important above DDR2-667 and you can give up any performance advantage with slower timings. DDR2-667 is a good match to COnroe bandwidth, and is better perfoming than 533 or 400 by a wider marging than you find above DDR2-667. It also appears Conroe responds better (performs better with increases) to DDR2 bandwidth increases than either Netburst or AM2.
Wesley Fink - Wednesday, July 19, 2006 - link
We would consider DDR2-667 the minimum memory to use with Conroe, and faster timings do generally improve performance.Sunrise089 - Wednesday, July 19, 2006 - link
I would like to know this as well.txt2000 - Wednesday, July 19, 2006 - link
Just wondering, if your going to spend ~$400 on memory if you would be better off with 4GB value DDR or 2GB high performance.Patsoe - Wednesday, July 19, 2006 - link
I suppose that completely depends on your usage pattern. Almost all of my activities fit within 512MB, and probably anything I do fits within 768MB. So getting faster RAM would do more for me than more of it.If you could fill 3GB, then a setup with 2GB will see a lot hard-disk swapping... even a very slow 4GB of RAM will do better in that case.
Andy4504 - Wednesday, July 19, 2006 - link
Anything over 1GB results in the OS addressing your memory differently. Never did the reasearch on how that different addressing affected system performance however.supremelaw - Wednesday, July 19, 2006 - link
http://www.anandtech.com/mb/showdoc.aspx?i=2797&am...">http://www.anandtech.com/mb/showdoc.aspx?i=2797&am...Timing and content were perfect for this article.
And, your earlier article on the nVidia 590 chipset
for Intel also dovetails perfectly: nice photos too.
August+ should be VERY interesting.
Many thanks!
Sincerely yours,
/s/ Paul Andrew Mitchell
Webmaster, Supreme Law Library
http://www.supremelaw.org/">http://www.supremelaw.org/
mobutu - Wednesday, July 19, 2006 - link
"The board was very stable with our X6800 and X6600 Core 2 Duo processors ..."It should have been E6700 (or maybe E6700)