Here are some performance results with the Asus A7M266 AMD 760 chipset motherboard. […]
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Here are some performance results with the Asus A7M266 AMD 760 chipset motherboard.
The CPU used is an unmodified Barton XP-M 2800+, the maximum "PowerNow! multiplier" this CPU can use is 16x. XP-M CPUs POSTs at the 11x multiplier in this motherboard.
I did not run an overclocked FSB other than a quick tests at 150 MHz, it seemed 2D stable but 3D-tests showed artifacts. I will test FSB overclocking with my other AMD 760 motherboard to see if this is a chipset limitation, if it's just the A7M266 or if it's the X1950 Pro which can not handle a 75 MHz AGP bus.
Barton XP-M 2800+ (16x133=2133 MHz): Super PI 1M
Barton 2800+ SuperPi1M.JPG
Barton XP-M 2800+ (16x133=2133 MHz): 7-Zip 32M
Barton 2800+ 7zip32M.JPG
The 3D benchmarks are heavily bottlenecked by the AMD 760 chipsets memory speed at 133 MHz. The gain between 1466 MHz and 1866 MHz in 3dmark 2001 is only 1000 points.
3dmark can't even initialize the X1950 Pro with the CPU at the 15x or 16x multiplier. This do not seem to be a stability issue but an AGP timing issue and is probably unrelated to the stability issues I saw with the Catalyst 9.3 driver.
[edit]
Ignore these benchmarks, I found out whats needed to be done to make the AMD 760 chipset run much better in 3D and I switched to the faster (at least with the X1950 Pro) Catalyst 9.3 driver. I ran into exactly the same performance issues with the X1950 Pro running in an Abit KG7 AMD 760 motherboard and also the exact same issue with 3dmark even failing to initialize the card at speeds greater than 1866 MHz. This made me try some other video cards using PCI-E-AGP bridges like the Radeon X850XT, the Geforce 6600GT and the Geforce 7600GS, none of them ran at a decent speed and while the system was perfectly stable in 2D at 2133 MHz it wasn't even fully stable in 3D at 1866 MHz.
At that point I thought perhaps the AMD 760 chipset sucks will all cards using these PCI-E-AGP bridges and switched to a Geforce 6800GT but the instability got even worse, this made my tinker with the advanced settings. I knew Asus recommended changing "CPU skew" from a default 3 to 0 which I tried in the Asus board. With the Asus board I diddn't see any real difference going from the default skrew value to the recomennded "0" though, performance was still good in 2D but the 3D performance kind of sucked.
I tried to change the CPU skew to 0 with the Abit board but found this setting amazingly unstable. If going in one direction makes the issue worse perhaps the other direction makes it better I thought and tried the other extreme, setting 7. Suddenly the stability issues were gone and the 3D performance is what could be expected with both the Geforce 6800GT and the Radeon X1950 Pro and the initialization issue with 3dmark is gone.
There is still the issue with The X1950 Pro not running 3Dmark03 Battle Of Proxycon with the Catalyst 9.3 driver when the CPU is running at a speed over 2 GHz just like with the ECS KT600 motherboard. I have inspected the cards cooler and it's not filled with dust, I replaced the thermal paste. I have also added one fan blowing air on the cards power circuitry and another fan blowing air on the PCI-E AGP bridge but the issue remains the same. This seems to be an issue with the combination of this card and the Catalyst 9.3 driver.
The Catalyst 9.3 driver also still produces a more uneven frame rate in 3Dmark 2001 compared to the 7.10 driver though as the memory becomes an even more obvious bottle neck with better video card performance.
The conclusion is that these old motherboards with AMD 760 really needs a hands on approch with faster CPUs and settings I would have thought only could affect stability also affects 3D performance.
edit2
After some more testing I'm now confident that no Nvidia card with PCI-E - AGP bridge will work with the AMD 760 chipset, or at least not with the Abit KG7. I have retested the 7600 GS and 6600GT and also tested a 7600GT and a 7800GS, none of these card works with any kind of stability regardless of CPU skew setting but briged ATI cards seems to work. Even if ATI cards works and performs well I think that it's probably best to use a non bridged Geforce 6800GT with AMD 760 motherboards.
/edit2
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Barton XP-M 2500+ (14x133=1866 MHz) Radeon X1950 Pro 512 AGP Catalyst 7.10: 3dmark 2001.
IGNORE these results, I will rerun the benchmarks with this motherboard later. For now I will post the results with the Abit KG7 and I would think the Asus A7M266 will perform about the same.
Barton 2500+ ATI Radeon X1950 Pro 512 3dmark2001.JPG
Barton XP-M 2500+ (14x133=1866 MHz) Radeon X1950 Pro 512 AGP Catalyst 7.10: 3dmark 03
IGNORE these results, I will rerun the benchmarks with this motherboard later. For now I will post the results with the Abit KG7 and I would think the Asus A7M266 will perform about the same.
Barton 2500+ ATI Radeon X1950 Pro 512 3dmark03.JPG