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
Overclocking: Asus A8N32-SLI Deluxe
The Asus A8N32-SLI set a new stock speed overclock record with this CPU at 246. This is likely a result of the excellent 8-phase power regulation of the Asus board, which greatly contributes to cool operation – even when pushed hard.
Lowering the multiplier to reach the highest CPU clock also yielded excellent performance – at 310 among the highest that we have tested. This Asus has an outstanding assortment of memory timing and voltage adjustments for overclocking, but they are somewhat unfamiliar. Given more time with this board, it is likely that we could achieve even higher reduced multiplier timings as we become more familiar with the memory adjustments. In general, the HyperTransport performs well when left on Auto, letting the board handle the HTT adjustments.
Other top overclockers like the DFI nForce4 series have extensive adjustments for tRef and Driving Strength. Best overclocking performance is often achieved on the DFI by reducing DDR Driving Strength with Samsung TCCD. The Asus has more limited Driving Strength and tRef adjustments, but it offers an extremely wide range of DDR Skew adjustments, which are missing from many enthusiast boards. The point is that Asus has taken a little different approach to controls, and it will take time to learn what works best with the available memories.
Asus also offers full Auto settings for those who do not wish to delve deeply into the BIOS for overclocking. There are even Auto Overclocking options in the BIOS where the board will set all parameters for best overclocking. These work well, but like other Auto OC options, the Asus can be pushed furthest with intelligent manual overclocking.
We were really unprepared for what a great overclocker the Asus turned out to be. The dual x16 is about graphics, and we really didn’t expect the excellent overclocking that this board delivers. It should be pointed out, however, that best overclocks are achieved with a single video card. While we reached 310x9 with a single 7800GTX, the best OC that we could achieve with a 7800GTX SLI setup was about 275.
| Asus A8N32-SLI Deluxe Overclocking Testbed | |
| Processor: | Athlon 64 4000+ (2.4GHz, 1MB Cache) |
| CPU Voltage: | 1.45V (default 1.40V) |
| Cooling: | Thermaltake Silent Boost K8 Heatsink/Fan |
| Power Supply: | OCZ Power Stream 520W |
| Memory: | OCZ PC3200 Platinum Rev. 2 (Samsung TCCD Memory Chips) |
| Hard Drive: | Seagate 120GB 7200RPM SATA 8MB Cache |
| Maximum OC: (Standard Ratio) |
246x12 (Auto HT, 2.5-3-3-7) 2952MHz (+23%) |
| Maximum FSB: (Lower Ratio) |
310 x 9 (3x HT, 1T) (2790MHz, 2 DIMMs in DC mode) (+55% Bus Overclock) |
The Asus A8N32-SLI set a new stock speed overclock record with this CPU at 246. This is likely a result of the excellent 8-phase power regulation of the Asus board, which greatly contributes to cool operation – even when pushed hard.
Lowering the multiplier to reach the highest CPU clock also yielded excellent performance – at 310 among the highest that we have tested. This Asus has an outstanding assortment of memory timing and voltage adjustments for overclocking, but they are somewhat unfamiliar. Given more time with this board, it is likely that we could achieve even higher reduced multiplier timings as we become more familiar with the memory adjustments. In general, the HyperTransport performs well when left on Auto, letting the board handle the HTT adjustments.
Other top overclockers like the DFI nForce4 series have extensive adjustments for tRef and Driving Strength. Best overclocking performance is often achieved on the DFI by reducing DDR Driving Strength with Samsung TCCD. The Asus has more limited Driving Strength and tRef adjustments, but it offers an extremely wide range of DDR Skew adjustments, which are missing from many enthusiast boards. The point is that Asus has taken a little different approach to controls, and it will take time to learn what works best with the available memories.
Asus also offers full Auto settings for those who do not wish to delve deeply into the BIOS for overclocking. There are even Auto Overclocking options in the BIOS where the board will set all parameters for best overclocking. These work well, but like other Auto OC options, the Asus can be pushed furthest with intelligent manual overclocking.
We were really unprepared for what a great overclocker the Asus turned out to be. The dual x16 is about graphics, and we really didn’t expect the excellent overclocking that this board delivers. It should be pointed out, however, that best overclocks are achieved with a single video card. While we reached 310x9 with a single 7800GTX, the best OC that we could achieve with a 7800GTX SLI setup was about 275.
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Per Hansson - Sunday, November 6, 2005 - link
Hi, what type of capacitors did Asus choose to use on this mainboard?It looks like all caps are of the same type, (bar the CPU filter caps) is it Chemicon perhaps?
Klaasman - Sunday, November 6, 2005 - link
You guys at Anandtech should try cleaning the dust out of your HSF once in a while.Wesley Fink - Sunday, November 6, 2005 - link
We have received a number of emails questioning our results since some other sites who found twice the performance with Dual x16 tested with the nVidia SLI-AA option enabled with Coolbits in very recent nVidia drivers.We have complete results of SLI-AA testing with Far Cry - Regulator, the same game tested by sites claiming the 50% performance gain for Dual x16, but we no increase at all in SLI-AA performance.
ALL components except the motherboard are the same. We even moved the hard drive between the systems to make SURE everything but the motherboard remained the same. Results were the Average of two runs with the very latest 81.87 videodrivers. Memory was 2x512MB of our standard OCZ PC3200 Platinum Rev. 2 at 2-2-2-7. Memory and CPU were exactly the same in both systems, and the same MSI 7800GTX cards were used for benchmarking.
nVidia SLI-AA Mode - Far Cry - Regulator Demo - 1600x1200
8X SLI-AA 16X SLI-AA
Asus A8N32-SLI Deluxe 37.22 20.59
DFI LANParty nF4 37.89 22.19
As you clearly see, there is NO difference with nVidia SLI-AA between Dual x8 and Dual x16. In fact the Dual x8 scores are slightly faster, but they are well within error margin and I would call them equivalent - the same.
Live - Sunday, November 6, 2005 - link
Nice to see this one cleard up. To bad you where right and they where wrong, performance wise that is.mctmcpoop - Saturday, November 5, 2005 - link
Cound you re-test and compare the result from different X16 bus in A8N32 ? If the X16 slot result from the NF4 chipset is lower compare to X16 from C51D , we can be sure that the C51D X16 is much faster than NF4 chipsetWesley Fink - Saturday, November 5, 2005 - link
This is a really good idea. The only problem is the Micro ATX boards that have this North Bridge do not normally have the memory timing options and other tweaks to allow a direct comparison. Also with an enabled integrated video on the C51 north bridge we are introducing a new variable. We will probably have to wait for other Dual x16 boards to see if we can duplicate these results on the newest, most demanding games.mctmcpoop - Saturday, November 5, 2005 - link
What I mean is test both of the X16 slot on A8N32 , one X16 bus should be from C51D pci express tunnel chip , the other X16 slot bus should be from the NF4 chip as other normal SLI board ... So if the right X16 slot get good score compare to left X16 slot , that means C51D chip has better design of the pci express x16 bus ...Wesley Fink - Sunday, November 6, 2005 - link
I ran some quick tests comparing the North x16 slot (nearest to CPU) and the South x16 slot on the Asus in the 3 new games that showed the big single-video increases. The South x16 slot was consistently slower than the one nearest the CPU by 2% to 6.7% in our single video performance tests. Perhaps there are difference in performance of the MCP51 and nF4 SLI which each drive one of these slots. We will look at these results again in future Dual x16 board reviews.lopri - Saturday, November 5, 2005 - link
Another question for Wesley:When you say OC isn't as good with SLI as with a single video card setup, is it in general? Or this particular board? Also, what's the reason for it? CPU? Chipset? Power regulation on the board?
Thanks again for a great review! I'm eagerly waiting for this board!
Wesley Fink - Saturday, November 5, 2005 - link
We have noticed that SLI will not overclock as high on other nForce4 boards as well, but I can't tell you the max on each one for SLI. I made this comment because I couldn't duplicate an overclock I had run earlier on this board, realized I had SLI set-up, removed the 2nd card and ran a few quick tests to see the impact of SLI on maximum overclock.