![]() Your L1 speed should be around 80 MB/s, L2 around 56 MB/s, and memory throughput around 44 MB/s. From my benchmark spreadsheet, I do not see any difference in the Speedsys "score" from write-back to write-through on AMD 486 chips. ![]() Your speedsys score has improved some, however I estimate it should be closer to 45. If it has &E, those are write-through only. For the WB-enabled Intel DX4's, look for an &EW on the face of the chip. ![]() Many users have also had success with a Cyrix 5x86-100 at 120 MHz. All of the Intel 486 DX4's I've tested work well at 120 MHz. If you want a fast 120 MHz system, you can consider one of the WB-enabled Intel DX4-100's or a Cyrix 5x86-100/120. The AMD "5x86" 133 chip is 16 KB write-back and the majority of them will run at 160 MHz. If you are looking for a high-end 486, you might want to consider a CPU with 16 KB of write-back cache. You also want to tighten up your system memory timings. You should use the "engineer mode" to tighten up those cache timings. I do have benchmarks for the 100 MHz write-thru chip though. I do not have any comparative benchmarks for the 120 MHz write-thru chip. After checking online, it does appear that there were some 120 MHz AMD 486 chips with write-through L1 cache, although from my experience, most 120 MHz AMD 486 chips were of the write-back variety.
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June 2023
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