Abit AT8: µGuru comes to the RD480
by Gary Key on March 10, 2006 12:05 AM EST- Posted in
- Motherboards
FSB Overclocking Results
Memory Stress Testing
Memory stress tests look at the ability of the Abit AT8 to operate at the officially supported memory frequencies of DDR-400, at the best performing memory timings that the OCZ PC4800 Platinum Edition will support.
The Abit AT8 was very stable with 2 DDR modules in Dual-Channel mode at the settings of 2-2-2-5 at 2.7V provided that we used the OCZ PC4800 memory and 1.1 BIOS. We will now install all four available memory slots, which will result in more strenuous requirements on the memory subsystem than testing 2 DDR modules on a motherboard.
The Abit AT8 was very stable with 4 DDR modules in Dual-Channel operation at the settings of 2-2-2-7, but required the command rate to be increased to 2T along with a voltage increase to 2.8. Once again, we had to utilize our OCZ PC4800 memory and BIOS 1.1 in order to achieve these settings. Although other memory types were fully compatible, they required the 1.1 BIOS and memory settings adjusted to SPD values in the BIOS for one reboot sequence before changing the memory settings manually.
| Front Side Bus Overclocking Testbed | |
| Processor: | AMD Athlon 64 4000+ ( San Diego) AMD Opteron 170 ( Toledo) |
| CPU Voltage: AMD Athlon 64 4000+ AMD Opteron 170 |
1.5250V (1.4000V default) 1.4500V (1.3500V default) |
| Memory Settings: | 2.5-3-3-7 1T - (12x) 2.5-3-3-7 1T - (10x) |
| Memory Voltage: | 2.9V +.30mV |
| NB 1.2V Setting: | 1.60V |
| HT Voltage: | 1.35V |
| LDT Multiplier: | 5x up to 250HTT, 4x up to 285HTT |
| Memory: | OCZ PC4800 Platinum Edition |
| Cooling: | Zalman CNPS9500 |
| Power Supply: | OCZ Power Stream 520 |
| Maximum CPU OverClock: (AMD Athlon 64 4000+) |
256HTT x 12 (3072MHz) +28% |
| Maximum HTT OverClock: (AMD Athlon 64 4000+) |
256HTT x 9 (2304MHz) +28% |
| Maximum CPU OverClock: (AMD Opteron 170) |
285HTT x 10 (2850MHz) +42% |
| Maximum HTT OverClock: (AMD Opteron 170) |
285HTT x 9 (2565MHz) +42% |
Memory Stress Testing
Memory stress tests look at the ability of the Abit AT8 to operate at the officially supported memory frequencies of DDR-400, at the best performing memory timings that the OCZ PC4800 Platinum Edition will support.
| Abit AT8 Stable DDR-400 Timings - 2 DIMMs (2/4 slots populated - 1 Dual-Channel Bank) |
|
| Clock Speed: | 200MHz |
| CAS Latency: | 2 |
| RAS to CAS Delay: | 2 |
| RAS Precharge: | 2 |
| RAS Cycle Time: | 5 |
| Command Rate: | 1T |
| Voltage: | 2.7V |
The Abit AT8 was very stable with 2 DDR modules in Dual-Channel mode at the settings of 2-2-2-5 at 2.7V provided that we used the OCZ PC4800 memory and 1.1 BIOS. We will now install all four available memory slots, which will result in more strenuous requirements on the memory subsystem than testing 2 DDR modules on a motherboard.
| Abit AT8 Stable DDR-400 Timings - 4 DIMMs (4/4 slots populated - 2 Dual-Channel Banks) |
|
| Clock Speed: | 200MHz (800FSB) |
| CAS Latency: | 2 |
| RAS to CAS Delay: | 2 |
| RAS Precharge: | 2 |
| RAS Cycle Time: | 7 |
| Command Rate: | 2T |
| Voltage: | 2.8V |
The Abit AT8 was very stable with 4 DDR modules in Dual-Channel operation at the settings of 2-2-2-7, but required the command rate to be increased to 2T along with a voltage increase to 2.8. Once again, we had to utilize our OCZ PC4800 memory and BIOS 1.1 in order to achieve these settings. Although other memory types were fully compatible, they required the 1.1 BIOS and memory settings adjusted to SPD values in the BIOS for one reboot sequence before changing the memory settings manually.
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Duplex - Tuesday, March 21, 2006 - link
I really liked it you did a test with BH5 at 1T 2225 timings,BUT,
I would be so much happier if you also could test at how high clocks you
can run at 1T 2225-timings. That is at least how I define overclocking memory.
You still have the board, so pleeeaaaaaaaaaaase give it a try!
You overclocked with 1T 2.5-5-5-7 timings, but as I´m sure you know it´s not the same thing as overclocking the memory with 1T-2-2-2-5 timings, which BH5/UTT owners mainly gain performance from.
This is something I miss with most of your reviews, and I think Many Many readers would appreciate if you both tryed overclocking with tight resp. lose timings in the future.
It´s often tight timings that makes the boards stand out from the rest.
CPU stability and overclocking seldom differs more than 10% while the RAM clocks at 1T-2-2-2-5 often is either 200MHz or something like 280MHz (40%). Many boards still can´t run 1T-2-2-2-5 at all.
Memory Performance is about 1. tight timings and 2. high clocks
Maybe my facts isn´t totally correct, but I hope you see what I´m aiming at :-)
Gary Key - Friday, March 24, 2006 - link
Hi,
We are currently testing another RD480 board so I will provide the highest stable overclock at 2-2-2-5(7)-1T for the Abit and Asus RD480 boards along with the new one.
Gary
Duplex - Friday, March 24, 2006 - link
Great! Splendido! Magnifico! eeeeh, Excellent! Much appreciated!Duplex - Wednesday, April 5, 2006 - link
How are things going with the revised 1.1 bios, is the 256HTT limit gone?Has there been any time to look into it? ;-)
I read the ECS-review. Nice to see the
"The ECS KA1 MVP was very stable with 2 DDR modules in Dual-Channel mode at the settings of 2-2-2-5 at 2.7v. We were able to operate the memory at this configuration up to a 226HTT x12 setting." !!
Whats happening with the tests you mentioned above with the Asus and Abit board?
Estimated publishing date?
FireTech - Friday, March 17, 2006 - link
Agreed, love the look of this MB for it's passive cooling and fan control options. I'll have to wait for the AT8 32X though as the AT8 is now discontinued here.Any news on the BIOS #1.1 results?
Gary Key - Monday, March 20, 2006 - link
So far so good. We are waiting on a particular GSkill module to arrive to complete testing.
SpHeRe31459 - Saturday, March 11, 2006 - link
Dolby Digital Live is an option that a vendor must persue with Dolby and get their motherboard certified. Abit has not shown interest in this before, nothing I can find at the Abit site says this is Dolby Digital Live enabled. You guys sure about the AT8 having DDL?Gary Key - Saturday, March 11, 2006 - link
http://www.abit.com.tw/page/en/motherboard/motherb...">AT8 SpecsThe audio specifications are listed on the global site. The US site has the AL8 specs on the webpage and Abit has been notified of this. Abit is now including the ALC-882D with the DDL option on their higher end boards. We did not see it as being offered originally on the AT8-32x (complained about it) but have been told it will be included now. In fact, their Global website has been updated and shows it on the board. The board I tested had the ALC-882D codec and DDL (5.1, optical out to supporting receiver) was enabled in the drivers I used.
cornfedone - Friday, March 10, 2006 - link
Looks like Abit, even though late to market, didn't bother testing their ATI chipset mobo before shipping it either. They must have figured if Asus could sell the completely junk A8R-MVP garbage, then there were plenty of fools who would rush out and buy the Abit version of garbage. You got to believe that judgment day isn't too far off for the Asian mobo companies if they keep shipping this kind of junk.It's pretty obvious Asus needs to switch product lines from PC hardware to rice cakes or chop suey so their skill set matches their products.
rjm55 - Saturday, March 11, 2006 - link
Looks like the paid nVidia forum posters are at it again. They must really be afraid of ATI chipsets to go to these extremes. Wonder why?It's a shame this decent review got hijacked by a few crazies whose only goal was to disrupt and discredit.