Ok to get this score i had the Radeon clocked at 250/250. The only way I found to hold this at this speed was to basicaly freeze the GPU. But to get better scores without going down this path is to change the heatsink and fan on the GPU.
I have tried many different ways to do this, the best I have found is to attach a old Duron heatsink and fan to the card. You will lose the use of one maybe two pci slots. Also add some heat sink compound onto the GPU and hold the HSF in place with cable ties. You want the fan so run as fast as you can get it anything above 4000 rpm is good.
The next step is to added some more fans to the case. I use a full tower case.
I have one fan at the bottom front one at the back in the middle. Then comes the DIY bit, cut holes in the top to add two more fans the extract the air from the case. Then with the side panel in place add two more fans the blow air into the case. The best place is to get these positioned one blowing air over the AGP and PCI Slots and one over the processor.
I also have HD coolers running as well this makes a huge difference in drive speeds.
Thats about the best you can get for air cooling in my view.
Next is to overclock the system itself, I have an ABIT KT7A Raid. I have the memory running at 133 with CAS 2 and it all set to turbo. You can sometimes get better speed with it set to FAST.
The most important change I found was to change the AGP Appature to 32Mb. This makes a difference to. I am not sure why but it does.
Then is just a matter of tweaking the other bios setting and checking if the machine runs.
To try this just run 3dmark and run the two high detail tests. if it doesn't fall over or lock up then run the benchmark.
I am also running R3D Tweak to get more control over the graphics card. Just play with the settings and see what you can do. I'd love to see what results you all can get.