Prototype Test Results
| Benchmark | No L2 Cache | 256K L2 Cache | Percentage change |
----------------------------------------------------
| 3DBench Slow | 52.6 | 66.6 | +26% |
| 3DBench Fast | 50.0 | 62.9 | +26% |
| Chris's 3DB | 34.2 fps | 38.3 fps | +12% |
| Chris's 3DB VGA | 10.3 fps | 11.5 fps | +12% |
| PC Player | 14.1 | 15.8 | + 12% |
| PC Player VGA | 5.3 | 5.5 | +4% |
| Doom Max | 29.8 fps | 35.9 fps | 20% |
| Quake TD | 9.5 fps | 10.3 fps | +8% |
| TopBench | 218 | 256 | 18% |
| SysInfo CPU | 128.0 | 198.1 | +55% |
Memory speed measurements
------------------------
| Cache Check |
No Cache ....| L1: 101, Main: 30.1
256K Cache | L1: 102.7, L2: 42.9, Main: 21.1
| SpeedSys |
No Cache ....| Mem Band: 76.15, CPU: 39.27, L1: 58.55, Main: 29.55
256K Cache | Mem Band: 47.37, CPU: 42.67, L1: 66.4, L2: 37,5, Main: 23.9
All in all, some pretty appreciable improvements, such as 20% improvement in Doom, nice!
Importantly, the external cache mode should be set to Write Back, such as this module supports, otherwise improvements are marginal if set to Write Through.
I seem to have taken a hit to system memory bandwidth after adding the cache, maybe some bios settings need tweaking.
Cache Check reports 19 clocks, up from 13.3 clocks without cache
@majestyk can you send me your bios settings for your GAC-2 ?
I will update these results, if I find a solution for this.
I did manage to make it a bit better, see post below
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