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ATI Radeon X1950XTX - Part 1 - GDDR4 cont.

We've chosen to use 3DMark 05 to test the importance of the memory bandwidth. We've also chosen to focus on game test 3 (canyon flight) since it is the test the most dependent on the graphics card. We start by running 3DMark 05 at the default resolution - 1024x768. We've clocked the memory at X1950XTX to X1900XTX and then overclocked it to X1950XTX to see how much the bandwidth matters.

3DMark 05 (total)
1024x768
X1950XTX 650/1143
  13775
 
X1950XTX 650/1000
  13495
 
X1900XTX 650/775
  13166
 
X1950XTX 650/775
  13055
 
  0 3200 6400 9600 12800 16000

Game Test 3 (Canyon Flight)
1024x768
X1950XTX 650/1143
  71.7
 
X1950XTX 650/1000
  69.95
 
X1900XTX 650/775
  67.2
 
X1950XTX 650/775
  66.6
 
  0 16 32 48 64 80

As expected the X1950XTX is a bit slower than X1900XTX at the same frequency. This is because the latencies are not as aggressive with GDDR4 as GDDR3. We continue with higher resolutions where the memory bandwidth becomes more crucial.

3DMark 05 (Total)
1920x1200
X1950XTX 650/1143
  10145
 
X1950XTX 650/1000
  9942
 
X1900XTX 650/775
  9689
 
X1950XTX 650/775
  9573
 
  0 2400 4800 7200 9600 12000

Game Test 3 (Canyon Flight)
1920x1200
X1950XTX 650/1143
  49.8
 
X1950XTX 650/1000
  48.6
 
X1900XTX 650/775
  46.7
 
X1950XTX 650/775
  46.2
 
  0 12 24 36 48 60

Oddly, we there's no real difference when using higher resolutions, which most likely means that the memory bandwidth is enough to supply the GPU with data. We therefore overclock the GPU to 750MHz to see how high percentage increase we get at a 775MHz and 1000MHz memory frequency.

% increase in total performance thanks to the memory
1024x768, 750MHz GPU
1000MHz
  7.2
 
775MHz
  6.6
 
  0 2 4 6 8 10

Just as expected we can see that the total performance increase in a linear with the memory bandwidth, some that bodes well before our coming CrossFire tests and world record attempts.

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