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Test notes
Since DDR2 and GDDR3 versions of the GeForce FX 5700 Ultra share the same 475MHz core clock speed and only differ in memory clocks by 44MHz, the cards should have roughly the same pixel pushing power. However, just to be sure, I've run a couple of benchmarks to confirm that the two cards produce roughly equivalent frame rates. Since we've covered the GeForce FX 5700 Ultra's performance extensively in other articles I've limited our test suite to focus on performance differences between the two 5700 Ultras.

While it's unlikely that our 3D performance tests will show much difference between DDR2 and GDDR3 versions of the 5700 Ultra, I've also thrown in a couple of power consumption tests that should highlight one of GDDR3's big selling points.

Our testing methods
All tests were run three times, and their results were averaged, using the following test system.

ProcessorAthlon 64 3200+ 2.0GHz
Front-side busHT 16-bit/800MHz downstream
HT 16-bit/800MHz upstream
MotherboardAbit KV8-MAX3
North bridgeVIA K8T800
South bridgeVIA VT8237
Chipset driverHyperion 4.51
Memory size512MB (1 DIMM)
Memory typeCorsair XMS3500 PC3000 DDR SDRAM
GraphicsNVIDIA GeForce FX 5700 Ultra 128MB
NVIDIA GeForce FX 5700 Ultra 128MB with GDDR3
Graphics driverForceware 56.64
Storage

Maxtor 740X-6L 40GB 7200RPM ATA/133 hard drive

Operating SystemWindows XP Professional
Service Pack 1 and DirectX 9.0b

We used the following versions of our test applications:

The test systems' Windows desktop was set at 1024x768 in 32-bit color at a 75Hz screen refresh rate. Vertical refresh sync (vsync) was disabled for all tests.

All the tests and methods we employed are publicly available and reproducible. If you have questions about our methods, hit our forums to talk with us about them.