Subject: AMD's FX-8150 "Zambezi" - Bulldozer in Action + Diep Chess test Benchmark Fri Oct 14, 2011 11:00 am
AMD's FX-8150 "Zambezi" - Bulldozer in Action
DIEP Chess
DIEP chess is simulating a chess game in which every possible move by the two opponents is simulated. The software uses exclusively integer operations to analyze the different permutations and combinations of moves. DIEP Chess is not optimized for one or the other cache strategy or size, however, it seems to get a major boost out of HyperThreading as shown below using the example of Intel's Core i7 965 (HT vs HT-).
Diep chess is exclusively integer based, incorporating a plethora of chess knowledge based on real chess play in an attempt to better understand and simulate the human mind. As a result branches and branch predictions play a major role for its execution speed. As this makes the codesize quite big, also the L1 misses play a minor role together with the latency of the memory controller.
This one is really interesting. Given the fact that eight integer cores should crunch away the nodes like Deep Thought, it is rather disappointing to see the FX-8150 once again trounced by the 6-core Thuban, not to mention the rest of the world. We can always blame it on Vincent but DIEP appears a prime example of how the small L1 caches together with the high access latencies reduce performance to literally 60% of what we would have expected.