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For this new approach to Crossfire, we will be benchmarking and analyzing its scalability. We will be comparing the new approach against the older generation of Crossfire, which will be using two X1950XTX video cards.
The test configuration:
|
Test Configuratoin |
|
Processor |
AMD Athlon 64 FX62
(2,8 GHz di clock, 1 Mbyte cache L2, Socket AM2) |
|
Motherboard |
ECS KA3 MVP (chipset
ATI Crossfire Xpress 3200) |
|
Memory |
Corsair CM2X512 8500
@ 800 MHz
2x1 Gbytes, timings 5-5-5-15 |
|
OS |
Windows XP Professional SP2 |
|
Driver Version |
ATI Catalyst 6.8
ATI Catalyst 6.10 beta (Radeon X1950PRO) |
| Video Card |
ATI Radeon X1950XTX
Crossfire
ATI Radeon X1950PRO Crossfire |
|
Scaling from 1 card to 2 in % |
|
Video Card |
Radeon
X1950PRO |
Radeon X1950XTX |
|
1280x1024 |
20% |
62,3% |
| 1600x1200 |
8,33% |
71,8% |
| 1920x1200 |
-12,4% |
76,7% |
| 2048x1536 |
-3,48% |
81,5% |
|
Scaling from 1 card to 2 in % |
|
Video Card |
Radeon
X1950PRO |
Radeon X1950XTX |
|
1280x1024 |
66,3% |
27,7% |
| 1600x1200 |
84,5% |
55,2% |
|
Scaling from 1 card to 2 in % |
|
Video Card |
Radeon
X1950PRO |
Radeon X1950XTX |
|
1280x1024 |
37,1% |
17% |
| 1600x1200 |
53,7% |
25,4% |
| 1920x1200 |
61,8% |
37,2% |
| 2048x1536 |
2,6% |
48,3% |
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Scaling from 1 card to 2 in % |
|
Video Card |
Radeon
X1950PRO |
Radeon X1950XTX |
|
1280x960 |
18,4% |
21,3% |
| 1600x1200 |
51,4% |
59,3% |
| 1920x1440 |
32% |
74,4% |
| 2048x1536 |
30% |
76,5% |
In Call of Duty 2, we see an unusual scene for the X1950 PRO Crossfire configuration. As the resolution is increased, with 4x aliasing and 16x anisotropic filtering enabled, the X1950 PRO Crossfire system begins to suffer in terms of performance. We believe the reason behind the low performance is that the configuration begins to face a bottleneck when the resolutions get raised. The Radeon X1950XTX Crossfire configuration, on the other hand, which has two cards that each have 512 Mbytes of video memory, does not display the same behavior.
In other titles, the Radeon X1950 PRO has scalability that for the most part is quite high. At times, however, there is still a bottleneck at higher resolutions.
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