Yesterday I put my 486 CPUs away after the massive 20 CPU showdown benchmark and re-assembled my Siemens-Nixdorf 486 - I discovered something odd about it. When I put in a DX 33 or DX 2/66, benchmark performance lines up with others from its class. When I put a DX/4 in there (through a VRM) - best I can get is performance on par with a 75-80 MHz 486 CPU. I thought the VRM was somehow causing the issue, so I put in an ODPR - Despite being a Pentium, it was bottlenecked at the same area (75-80 MHz).
Weird. Good thing it's not really 1994 and I didn't pay those dollars for a 20-25% CPU cut on performance! It works well enough for the odd times I do use it, and it is faster than the 66 MHz it came with, so there's that.
I also benchmarked that computer's integrated S3 video card vs the ATI Mach32 (2Mb NVRAM) and Genoa Phantom 32i (2Mb DRAM) VLB cards.
These two are going into my PS/1000 tonight to test against its own built in CL chip to see if it's going to be worth me buying another TSENG (or repairing the other one I have)
Testbed - Siemens Nixdorf PCD-4H 486 DX4/100, bare boot into DOS.
Results:
Genoa 2Mb TSENGET4000 2Mb

3DBench - 62.5
Chris B 's - 43.0 (fps)
PCPbench - 7.0 (640x400)
PCPbench - 16.9 (VGA)
Doom - 1299 Realtics
Computer's built in video card (S3 86C805-P) 1 Mb
3DBench - 66.6
Chris B's - 36.5 (fps)
(can't PCPbench in 640x400)
PCPbench - 16 (VGA)
Doom - 1294 Realtics
ATI Mach32 w 2Mb VRAM

3DBench - 62.5
Chris B 's - 43.0 (fps)
PCPbench - 7.0 (640x400)
PCPbench - 16.9 (VGA)
Doom - 1343 Realtics
Looks like in this computer, the bottleneck cuts the performance of the ATI and the TSENG at around the same spot.
I'm curious to see how these will stack up in the PS/1000.
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