AMD Radeon HD6990 Review

To overclock today we are using AMD's Catalyst Control Centre. The HD6990 is set to performance/'OC' mode.

We didn't expect to get this card much past 900MHz, but our final result of 950MHz, shows an 8 per cent core clock increase which is pretty reasonable. The card wouldn't hardlock right up to 1000MHz, but we noticed some minor artifacting and opted for the safest figures without any issues onscreen. A final memory clock of 1425MHz (or 5.7GBps effective) is a very good result.

Let us see how it affected the performance in a few of our benchmarks.

This is the first time we have seen over 10,000 points in 3DMark 11 from a single card, in our manually overclocked state. A whopping 5 extra frames per second is recorded from the intensive Unigine Heaven Benchmark.

When you factor in that two XFX HD5970 Black Edition cards are only generating 8 fps extra, and cost £1,800 last year, this is a fantastic result for AMD's new high end solution.

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