DFI nForce4: SLI and Ultra for Mad Overclockers
by Wesley Fink on February 5, 2005 9:30 AM EST- Posted in
- Motherboards
Memory Stress Testing
Optimum tRAS
In past reviews, memory bandwidth tests established that a tRAS of 10 was optimal for the nForce3 chipset and a tRAS setting of 11 or 12 was generally best for nForce2. Since this was the first memory stress test of a production nForce4 board, tRAS timings were first tested with memtest86, a free diagnostic program with its own boot OS that will boot from either a floppy disk or optical disk. Bandwidth was measured from tRAS 5 to tRAS 11 to determine the best setting.
| Memtest86 Bandwidth DFI nForce4 with Athlon64 4000+ |
|
| 5 tRAS | 2191 |
| 6 tRAS | 2242 |
| 7 tRAS | 2242 |
| 8 tRAS | 2242 |
| 9 tRAS | 2141 |
| 10 tRAS | 2141 |
| 11 tRAS | 2092 |
The best bandwidth was achieved in the 6 to 8 range with this combination of nForce4 and the 4000+, so a mid-value tRAS of 7 was chosen for all tests.
Memory Stress Tests
Our memory stress test measures the ability of the DFI to operate at its officially supported memory frequency (400MHz DDR), at the lowest memory timings that OCZ PC3200 Platinum Rev. 2 modules will support. All DIMMs used for stress testing were 512MB double-sided (or double-bank) memory. To make sure that memory performed properly in Dual-Channel mode, memory was only tested using either one dual-channel (2 DIMMs) or 2 dual-channels (4 DIMMs).
| Stable DDR400 Timings - One Dual-Channel (2/4 DIMMs populated) |
|
| Clock Speed: | 200MHz |
| CAS Latency: | 2 |
| RAS to CAS Delay: | 2T |
| RAS Precharge: | 7T |
| Precharge Delay: | 2T |
| Command Rate: | 1T |
Using two DIMMs in Dual-Channel 128-bit mode, the memory performed in all benchmarks at the fastest 2-2-2-7 timings, at default 2.6V voltage.
Tests with 4 DS DIMMs on an AMD Athlon 64 system are more demanding, since AMD specifies DDR333 for this combination. However, most AMD Athlon 64 motherboards combined with recent AMD processors (the memory controller is on the AMD CPU) have been able to handle 4 DIMMs at DDR400.
| Stable DDR400 Timings - 4 DIMMs (4/4 DIMMs populated) |
|
| Clock Speed: | 200MHz |
| CAS Latency: | 2.0 |
| RAS to CAS Delay: | 2T |
| RAS Precharge: | 7T |
| Precharge Delay: | 2T |
| Command Rate: | 2T |
Tests with all four DIMM slots populated on the DFI nForce4 boards required a 2T Command Rate with 4 DS DIMMs in two dual channels. This is the pattern seen on other top-performing Socket 939 boards, but we hoped that higher voltage might allow us to eek out 4 DS DIMM 1T performance. However, additional voltage did not help and DDR400 with 4DS DIMMs still required a 2T Command Rate on the DFI nForce4 boards.
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chevas - Tuesday, February 8, 2005 - link
Did I miss something? Why do I not see the A8N-SLI deluxe included in these tests?!?Penth - Tuesday, February 8, 2005 - link
NO SLI Bridge? What am I to do with my Ultra-D now?beany323 - Monday, February 7, 2005 - link
bigtoe36 - Monday, February 7, 2005 - link
many companies have applied chipset tweaks with Asus pioneering PAT on 865PE boards from the onset...seems all of a suden the tier ones are being made to tow the line???ViRGE - Sunday, February 6, 2005 - link
Wesley, that's certainly a very believable story. Though Asus is a very good mobo company, they're also who I would suspect any such complainer to be. They're the most powerful tier 1 last I checked, and most likely to lose SLI sales due to semi-SLI, in part because it wouldn't be like them to release their own semi-SLI board. I'd hate to think that someone is trying to kill the modding community like that though.bbomb - Sunday, February 6, 2005 - link
Nvidia is going to kill off SLI before it even gets off the ground by making it the most insanely difficult and expensive thing for computer users to do. Why cant they make it so that you can just slap in any two nvidia cards and get SLI to work? Why do they have to make it so that motherboards now cost over $250 retail for an SLI version?I pray to god that ATI's version is half the price of Nvidias and allows any two ATI cards to work in an SLI fashion just top put Nvida back in their place. I bet the Nvidia prevents any ATI cards from working in SLI mode on any Nforce chipset should ATI get that to work.
This is what happens when graphics card companies use their chipsets to restrict what computer users can do with that companies video cards. I do belive that Nvidia said that they were two separate businesses but now they must have combined them to place the most restricitons possible through drivers to prevent affordable solutions from coming out.
F you Nvida it's all ATI and Via for me now.
Wesley Fink - Sunday, February 6, 2005 - link
#93 - There was no press at all on the MSI "semi-SLI" Ultra - just a couple of posts on Forums - and nVidia was all over it. MSI said they canned the idea and the nVidia drivers were quickly changed so "semi-sli" would not work with current drivers on the Ultra.I doubt it was the press that caused this to happen. Ultra chip shipments were still going to all the manufacturers after the "mod" article went up on January 18th and there was not one word from nVidia until Friday February 4.
The best we can figure is that a powerful tier 1 manufacturer complained loudly to nVidia late this week that they were losing SLI sales to DFI because of the "illegal" SLI. nVidia was forced to act due to the political clout of this manufacturer.
Of course nVidia had other options as well. They could have decided to lower the price of SLI and discontinue Ultra, which is what we thought would happen.
bigtoe36 - Sunday, February 6, 2005 - link
#93It was all over the forums MSI had a semi SLI board and NV came down on them hard...nothing was in the "official press" though.
I have a feeling a tier 1 has moaned here as DFI are tier 2 and probably had no help designing the board...so pretty much went it alone and designed the board how they wanted to.
I would have thought the best move would have been to lower the cost of SLI and remove the "branding tax" and drop the Ultra chipset.
Still NV make the decissions here not us.
arfan - Sunday, February 6, 2005 - link
likes what i say, nvida is not stupid, i hope via can make sli mobo with cheap pricestephenbrooks - Sunday, February 6, 2005 - link
It's time for another "The message is clear:" thing.If chip manufacturers want to sell different products at different prices they should make sure they use DIFFERENT CHIPS! Nobody can pencil mod across a submicron trace. Why oh why do they do this and then put the lock in software?! I suspect it's because they wanted to be able to make a load of generic chips and brand them as the market demands.
Still... it's stupid! I remember reading AT's article on that pencil mod and had to blink a few times to make sure I was reading it right... :)