Asus A8R32-MVP Deluxe: First ATI RD580
by Wesley Fink on March 1, 2006 9:00 AM EST- Posted in
- Motherboards
Optimum tRAS
In past reviews, memory bandwidth tests established that a tRAS setting of 11 or 12 was generally best for nForce2, a tRAS of 10 was optimal for the nForce3 chipset, a tRAS of 7 was optimal for the nForce4/ATI RD480/ULi M1697 chipsets, and a tRAS of 10 produced the best bandwidth on the ULi 1695.
Since this is our first review of a board with the new ATI RD580 chipset, 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 of OCZ PC3200 Platinum Rev. 2, based on Samsung TCCD chips, was measured from tRAS 5 to tRAS 15 to determine the best setting.
The tRAS setting that produced the highest memory bandwidth with the ATI RD580 chipset was 8. The tRas 8 setting was used for all memory testing on the Asus A8R32-MVP Deluxe.
Memory Stress Testing
The Asus A8R32-MVP easily handles 2-2-2-8-1T timings at stock speed. The default setting for Command Rate in the Asus BIOS is 1T, which makes it much easier to assure that the A8R32-MVP consistently delivers top performance than the 2T default seen in the earlier A8R-MVP. We are pleased that Asus decided to implement the more sensible 1T timings in the update to the A8R-MVP.
Running four double-sided 512MB or 1GB DIMMs is much more demanding than running two DS DIMMs, and Asus did not have any special magic here. Like every board that we have tested, except the DFI RDX200, we needed to drop the Command Rate to 2T with 4 DS DIMMs. This really should not be a surprise, since the DIMM timing is primarily a function of the memory controller on the AMD processor. With 4 DIMMs, the A8R32-MVP remained stable with the same aggressive 2-2-2-8 timings that worked best for two DS DIMMs.
*8T was determined by MemTest86 benchmarks to deliver the widest bandwidth with the ATI RD580 chipset. While the board would operate at tRAS of 5T or lower all benchmarks were run at 8T.
In past reviews, memory bandwidth tests established that a tRAS setting of 11 or 12 was generally best for nForce2, a tRAS of 10 was optimal for the nForce3 chipset, a tRAS of 7 was optimal for the nForce4/ATI RD480/ULi M1697 chipsets, and a tRAS of 10 produced the best bandwidth on the ULi 1695.
Since this is our first review of a board with the new ATI RD580 chipset, 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 of OCZ PC3200 Platinum Rev. 2, based on Samsung TCCD chips, was measured from tRAS 5 to tRAS 15 to determine the best setting.
| Memtest86 Bandwidth Asus A8R32-MVP with Athlon 64 4000+ |
|
| 5 tRAS | 1879 |
| 6 tRAS | 1879 |
| 7 tRAS | 1999 |
| 8 tRAS | 2043 |
| 9 tRAS | 1999 |
| 10 tRAS | 1958 |
| 11 tRAS | 1958 |
| 12 tRAS | 1879 |
| 13 tRAS | 1870 |
| 14 tRAS | 1843 |
| 15 tRAS | 1807 |
The tRAS setting that produced the highest memory bandwidth with the ATI RD580 chipset was 8. The tRas 8 setting was used for all memory testing on the Asus A8R32-MVP Deluxe.
Memory Stress Testing
The Asus A8R32-MVP easily handles 2-2-2-8-1T timings at stock speed. The default setting for Command Rate in the Asus BIOS is 1T, which makes it much easier to assure that the A8R32-MVP consistently delivers top performance than the 2T default seen in the earlier A8R-MVP. We are pleased that Asus decided to implement the more sensible 1T timings in the update to the A8R-MVP.
Running four double-sided 512MB or 1GB DIMMs is much more demanding than running two DS DIMMs, and Asus did not have any special magic here. Like every board that we have tested, except the DFI RDX200, we needed to drop the Command Rate to 2T with 4 DS DIMMs. This really should not be a surprise, since the DIMM timing is primarily a function of the memory controller on the AMD processor. With 4 DIMMs, the A8R32-MVP remained stable with the same aggressive 2-2-2-8 timings that worked best for two DS DIMMs.
| Stable DDR400 Timings - 4 DIMMs (4/4 DIMMs populated) |
|
| Clock Speed: | 200MHz |
| CAS Latency: | 2.0 |
| RAS to CAS Delay: | 2T |
| RAS Precharge: | 8T* |
| Precharge Delay: | 2T |
| Command Rate: | 2T |
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Beenthere - Monday, February 20, 2006 - link
No flames at Anandtech. Asus is the mfg. and the one responsible for delivering a proper vcore circuit design, using quality components, etc.Don't shoot the messenger for stating the facts. If Asus didn't have design and engineering problems their mobos wouldn't have these confirmed issues reported by numerous hardware review sites.
arswihart - Sunday, February 19, 2006 - link
Do you have to use the same color RAM slots on ASUS boards for dual-channel, as shown in the pic in this review?Shimmishim - Sunday, February 19, 2006 - link
it's good to see you catch your mistakes from your previous reviews. i hope next time you'll take users comments/emails more seriously than just brushing it off simply as "others can do it..." other than that. this board looks great! its a shame all this good stuff is coming out 1/2 quarters before AM2 is being released.godrod - Friday, February 17, 2006 - link
I need to know on this board if you only have one video card (x1800XT) can you put it into the upper PCI-E slot closest to the CPU socket or does it have to go into the lower slot like the SD480 boards.Wesley Fink - Friday, February 17, 2006 - link
A single video card can go into either x16 PCIe slot. We tried both slots and it will work wekk in either.arswihart - Sunday, February 19, 2006 - link
this looks nice, I haven't moved from AGP yet, this may just make me do itBeenthere - Friday, February 17, 2006 - link
After Asus's false advertising of the A8R-MVP as being designed for "Serious Overclockers"; After Asus's failure to fix the long list of defects on the A8R-MVP which include 1T memory, Vcore instability, BIOS issues, etc.; After Asus's failure to acknowledge the known problems with the A8R-MVP; After Asus's refusal to even discuss the problems of the A8R-MVP with customers; After Asus's refusal to provide a proper BIOS upgrade to correct the defects in the A8R-MVP; After Asus's denial that the A8R-MVP mobo even existed after people bought it; After Asus's refusal to provide the same BIOS to consumers that they provided to Anandtech...there will never be another Asus product purchased by our company. Asus can stick their entire product line where the Sun don't shine. They've burned us for the last time. They may think they got away with defrauding consumers with the defective A8R-MVP mobos but they are in for one big surprise.
DanaGoyette - Sunday, February 19, 2006 - link
Refusal to provide the same BIOS...Hey, that gives me an idea! I wonder if Anandtech still has their A8R-MBP -- if they do, they should make a bios backup and post it!
matthewfoley - Wednesday, March 1, 2006 - link
If any of you read the article they offered anyone who emailed them a copy of the same bios that they used. If you really want it I can get it for you.DanaGoyette - Sunday, March 5, 2006 - link
Oh, I don't even have the board, but shouldn't it be easy to post the BIOS on the site rather than just through e-mail?