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Devil May Cry 4
Devil May Cry 4 is the latest game in the series from Capcom, and
also happens to include a pretty nifty benchmark. The
benchmark was run at max quality settings at 1920x1200.
Single 4870 X2:

The first test shows how the benchmark runs with a single 4870 X2.
The four different tests average at 189 FPS, 134 FPS, 196 FPS, and
135 FPS. This card definitely destroys this benchmark.
Let's see how Quadfire does, shall we?
Quadfire:

Surprisingly, the Quadfire setup scales in this benchmark very
well. With the four tests averaging 359 FPS, 259 FPS, 369
FPS, and 225 FPS, the scaling amounts to 90%, 94%, 88%, and 66%,
respectively. This would suggest that there is very little CPU
overhead in this benchmark. Let's overclock the CPU and find
out for sure.
Quadfire with 4GHz CPU:

As expected, bumping the CPU to 4GHz did very little, with only
2.6%, 0%, 5%, and 4.2% performance increases.
Race Driver GRID
GRID is the latest racing game from Codemasters, the same company
that has brought us titles such as Colin McRae, Operation
Flashpoint, and TOCA. If you haven't had the opportunity to
play GRID, I highly recommend you give the game a shot. It
reminds me very much of one of my all-time favorite racing games:
Need for Speed: Porsche Unleashed.
For testing in GRID, I tested at 1920x1200 with all settings maxed
out, and each level of AA used for each test. I used the San
Francisco circuit, with the Ravenwest Viper in the Pro Muscle
category. Framerate was captured by FRAPs, reporting Minimum,
Maximum and Average framerates. Most sites report Average framerates
only, which is a bit of a disservice, as I think Minimum framerate
is a bigger factor into whether or not gameplay is adversely
affected, especially if Average framerates exceed 60FPS. Due
to the nature of in-game benchmarking, no two sequences will be
identical, which may show up as variance in the final results.
The results should be adequate to determine performance trends,
however.

In the
graph above, we can see that the Quadfire setup actually
performed slightly worse for most settings. Overclocking the
CPU to 4GHz also did not change the overall score very much, either.
I think this just goes to show that GRID just does not scale very
well in Quadfire. It is notable to look at AA performance
scaling in this game for the ATi architecture, however, as another
game shows nearly no performance hit from 0xAA to 8xAA.
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