Asus A8N32-SLI Deluxe: NVIDIA Dual x16 for the Athlon 64
by Wesley Fink on November 6, 2005 9:00 AM EST- Posted in
- Motherboards
Final Words
It's a shame that the first task in reviewing the truly excellent Asus A8N32-SLI Deluxe is to set the record straight. Despite what you may have seen at other web sites, we can tell you conclusively that the Asus A8N32-SLI is not 40% to 50% faster in some games than the current Dual x8 designs. Those who concluded this overlooked the impact of the new 81.85 NVIDIA drivers and 6.82 platform drivers on the board's performance. These new drivers are definitely faster - so much so that current NVIDIA owners should definitely upgrade their video drivers.
We truly expected no increase in performance at all with the new Asus Dual x16 once the playing field was leveled. What we actually found, however, was that the A8N32-SLI Deluxe is slightly faster in both single video and SLI running our current test suite games like Doom 3, Far Cry, and Aquamark 3. The A8N32-SLI is faster, but at levels that are generally within the margin of error.
There is more to the story though. While we can't fully explain why it is faster, we did find the Asus A8N32-SLI Deluxe to be as much as 8% faster on the newest games that we tested in SLI mode, and up to a whopping 17% faster in single video mode with single/dual 7800GTX video cards. These are significant increases in performance that can't be ignored. We don't know why this is the case, and we will be testing this further as more Dual x16 boards appear in the marketplace. Perhaps it is the Asus design, perhaps it is the MCP51, and perhaps it could be anything.
Please do not let the debunking of the 40% to 50% claims that others have made for this board's performance sway your opinion of the Asus A8N32-SLI. This is one fast Socket 939 motherboard worthy of a place in any enthusiast's Athlon 64 system. The 8-phase works very well to keep the board stable and cool, the heat pipes and no fans really work, and Asus even provides optional cooling fans for those who will use water cooling with this board. If you want to build a super performance, silent PC or a water-cooled or phase-change cooled super overclocker, the A8N32-SLI will serve you well. We couldn't say anything close to this about recent Asus boards, but Asus obviously designed this board to turn some heads in the Athlon 64 market.
The Asus A8N32-SLI is also a monster overclocker, reaching the highest overclock ever with our stock CPU and to 310FSB with a reduced multiplier. If you compare this performance to our other reviews of recent Asus Socket 939 boards, you may wonder if they were produced by the same company. Asus has become serious about Athlon 64, and it shows in the design, execution and performance of the A8N32-SLI Deluxe.
The A8N32-SLI is blessed with a unique and very effective design that truly works. The 8-phase design behaves gracefully under extreme loads and remains much cooler than other 3- or 4-phase designs. This yields excellent stability and headroom that we have not seen before on an Asus Socket 939 design. Asus claims that the board is up to 15°C (36°F) cooler than conventional solutions, and we saw nothing in our testing to make us doubt this claim. The board remained cool and stable under the most difficult test conditions.
In the end, we still have some reservations as to whether Dual x16 makes any difference at all in video performance. It certainly appears to improve performance greatly in the latest, greatest, and most demanding games, but we will need to dismiss other potential explanations before we become a true believer. We do not, however, have reservations about the A8N32-SLI Deluxe. This board is a definite keeper.
It's a shame that the first task in reviewing the truly excellent Asus A8N32-SLI Deluxe is to set the record straight. Despite what you may have seen at other web sites, we can tell you conclusively that the Asus A8N32-SLI is not 40% to 50% faster in some games than the current Dual x8 designs. Those who concluded this overlooked the impact of the new 81.85 NVIDIA drivers and 6.82 platform drivers on the board's performance. These new drivers are definitely faster - so much so that current NVIDIA owners should definitely upgrade their video drivers.
We truly expected no increase in performance at all with the new Asus Dual x16 once the playing field was leveled. What we actually found, however, was that the A8N32-SLI Deluxe is slightly faster in both single video and SLI running our current test suite games like Doom 3, Far Cry, and Aquamark 3. The A8N32-SLI is faster, but at levels that are generally within the margin of error.
There is more to the story though. While we can't fully explain why it is faster, we did find the Asus A8N32-SLI Deluxe to be as much as 8% faster on the newest games that we tested in SLI mode, and up to a whopping 17% faster in single video mode with single/dual 7800GTX video cards. These are significant increases in performance that can't be ignored. We don't know why this is the case, and we will be testing this further as more Dual x16 boards appear in the marketplace. Perhaps it is the Asus design, perhaps it is the MCP51, and perhaps it could be anything.
Please do not let the debunking of the 40% to 50% claims that others have made for this board's performance sway your opinion of the Asus A8N32-SLI. This is one fast Socket 939 motherboard worthy of a place in any enthusiast's Athlon 64 system. The 8-phase works very well to keep the board stable and cool, the heat pipes and no fans really work, and Asus even provides optional cooling fans for those who will use water cooling with this board. If you want to build a super performance, silent PC or a water-cooled or phase-change cooled super overclocker, the A8N32-SLI will serve you well. We couldn't say anything close to this about recent Asus boards, but Asus obviously designed this board to turn some heads in the Athlon 64 market.
The Asus A8N32-SLI is also a monster overclocker, reaching the highest overclock ever with our stock CPU and to 310FSB with a reduced multiplier. If you compare this performance to our other reviews of recent Asus Socket 939 boards, you may wonder if they were produced by the same company. Asus has become serious about Athlon 64, and it shows in the design, execution and performance of the A8N32-SLI Deluxe.
The A8N32-SLI is blessed with a unique and very effective design that truly works. The 8-phase design behaves gracefully under extreme loads and remains much cooler than other 3- or 4-phase designs. This yields excellent stability and headroom that we have not seen before on an Asus Socket 939 design. Asus claims that the board is up to 15°C (36°F) cooler than conventional solutions, and we saw nothing in our testing to make us doubt this claim. The board remained cool and stable under the most difficult test conditions.
In the end, we still have some reservations as to whether Dual x16 makes any difference at all in video performance. It certainly appears to improve performance greatly in the latest, greatest, and most demanding games, but we will need to dismiss other potential explanations before we become a true believer. We do not, however, have reservations about the A8N32-SLI Deluxe. This board is a definite keeper.
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Wesley Fink - Friday, November 4, 2005 - link
We did not test with an XP90 or XP120. What I can tell you is the fan on our Thermaltake heatsink (in the picture of the optional HS fan in the review) is an 80mm. I just measured and there is still an additional 1/2" clearnance to theheatsink and heatpipes on the IO and bottom sides and an additional 1" to the heatsink at the top of the socket. My guess based on these measurements is that an XP90 should be fine, but I'm not sure about an XP120.Rike - Friday, November 4, 2005 - link
Regarding the HS, is it just me or is there a lot of dust in the fins?Peldor - Friday, November 4, 2005 - link
I don't think you should be ripping on "other" sites for claiming x16 lane SLI has big benefits over x8, when http://www.anandtech.com/mb/showdoc.aspx?i=2580&am...">Anandtech showed the same thing on a P4 board. You certainly didn't make it clear in that article that the 81.85 drivers were the primary reason for the higher scores.wbloon - Sunday, December 18, 2005 - link
Yes they did, you must have only skimmed the article. Go back and do your homework before showing your lassitude, dude.Gary Key - Friday, November 4, 2005 - link
I think the Intel article was very clear about indicating several factors played into the results we witnessed-This topic has been discussed greatly in the comments section of the Intel article. I also stated in the game section the base improvement of the Asus board over the MSI board was 3% on average. I attribute this to bios optimizations, board design, and possibly improvements in the A3 stepping of the C19 Northbridge. The difference we found between the boards utilizing a very GPU intensive game (F.E.A.R.) ran from 6% to almost 11% indicating in this particular game an advantage/optimizations of the x16SLI over the X8SLI. The difference in going from 11% to 25% when implementing AA/AF is probably 90%+ due to the 81.85 driver set in my opinion. After statements from several readers I further clarified my statement on this increase in the article. However, I firmly believe with the right GPU setup and application there is a true improvement due to the additional bandwidth with the x16SLI.
You cannot directly compare the Intel and AMD board due to the differences in the Northbridge chipset (C19 vs CK51) and the fact the memory controller is integrated in the Intel Northbridge instead of on the CPU in AMD's case. Wesley noticed differences in the single card benchmarks of up to 17% where mine were within the reported differences between the board designs (we will also test with a single core P4EE which should reduce the cpu bottleneck on the Intel board at higher resolutions). I have additional x8sli boards at this time and a revised bios for the MSI P4N that will be tested for a mini-update on this subject. We should see additional x16SLI boards in December for head to head tests utilizing the same chipset.
Also, not all games or applications showed this type of increase as stated. We had some issues with the BF2 SLI benchmarks but should have those worked out shortly but I imagine this will be one game that also benefits directly from the x16SLI setup.
Thank you. :)
Wesley Fink - Friday, November 4, 2005 - link
There is a BIG difference between 0% to 8% SLI performance improvement and the 40% to 50% claimed in one review we saw. We thought it would be unprofessional to "name names", but with all the hype that 40% to 50% claim generated in many Forums we needed to address the facts head on.Our video review team plans an article looking at the performance increases in both the new nVidia and ATI drivers in an upcoming article. We have seen results on the newest games on this Asus with 81.85 as much as 40% higher than other nF4 boards tested with 78.01. However, most of that was drivers since we could only find increases of 0% to 8% in SLI and 0% to 17% in single 7800GTX. These are significant, but they aren't a 50% increase.
Hanners - Friday, November 4, 2005 - link
Except, unlike the site I believe you are thinking of, you haven't done any testing (that I can see) using SLI AA, which is the one feature of NVIDIA's SLI feature set that will benefit greatly from the availability of two 'true' 16x PCI Express slots, as it transfers data via the PCI Express bus rather than using the inter-GPU connector as per other SLI modes.Wesley Fink - Friday, November 4, 2005 - link
You are correct that we did not select 8X or 16X AA in the nVidia driver, which I believe is the feature you are talking about. We selected anti-aliasing in the game, as we have in the past with our testing. We are looking into the possible impact of the "in-driver" AA on test results.Wesley Fink - Friday, November 4, 2005 - link
ALL of our game tests are 4XAA and 8XAF where that can be set - both SLI and single video. All game tests were run at 1600x1200. Please read the title bars and the Test Setup. This is clearly spelled out in the review.Leper Messiah - Friday, November 4, 2005 - link
oooh. I have my NF4 mobo. This thing is bought as soon as I see one in stock...