First post, by athlon-power
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I got bored while waiting for parts to show up for my PII 400 machine, so I started pushing the P200 in my SS7 build to see if it could do anything. Spoiler: it can't.
This is the worst overclocker I've ever seen. This CPU can do only four things: underclock, stay the same, overclock slightly, or cause a Windows protection error. I will attach a log I made while testing with Quake running under Windows 98, but the results and what the motherboard said indicate that this CPU can only do 166, 200, and 233*MHz.
This was done with a PCChips M570, 32MB of PC100 SDRAM, an S3 Trio 3D, an ESS1869F, and a 3Com EtherLink III ISA running on Windows 98. ISA bus was restricted to ~7MHz while I changed bus speeds, but ran at PCICLK/4 (~8MHz) while I was running at the native 66.6MHz. All of the "auto" settings had the ISA bus at ~7MHz even though it was at 66MHz, and that was just because I accidentally did the first benchmark like that so I decided to not change the setting and keep it at ~7MHz for the duration of that part of the test.
While messing with the FSB and multipliers, I ended up going extreme on the theoretical CPU speeds once I realized that what I was doing was changing nothing. That's why I was "pushing it to 412MHz," because no matter what I did, the motherboard would report 233MHz and I'd get little to no performance improvement, or a real overclock at all.
*=I have no idea if it really was 233 or not. The one I know that seemed to legitimately overclock it was pushing it to 225MHz. That's it.
Log:
Pentium MMX 200 Overclock
Quake, 320x200, timedemo demo3
All done on 2.8v unless otherwise specified
Overclock using “user define” to change bus speeds/multipliers
199.8 66.6x3: 28 seconds, 39 FPS (motherboard reports 200MHz)
225 75x3: 24.8 seconds, 43.9 FPS (motherboard reports 233MHz)
249.9 83.3x3: Windows protection error (motherboard reports 233MHz)
266.4 66.6x4: 30.5 seconds 35.7 FPS (motherboard reports 166MHz)
299.7 66.6x4.5: 30.7 seconds, 35.5 FPS (motherboard reports 166MHz)
225 75x3: 24.8 seconds 43.9 FPS (motherboard reports 233MHz)
300 75x4: 27.9 seconds 39.1 FPS (motherboard reports 190MHz)
249.9 83.3x3 2.9v: Windows protection error (motherboard reports 233MHz)
337.5 75x4.5: 27.7 seconds 39.4 FPS (motherboard reports 190MHz)
375 75x5: 24.8 seconds 43.9 FPS (motherboard reports 233MHz)
412.5 75x5.5: 25.1 seconds 43.5 FPS (motherboard reports 233MHz)
??? 75x1.5/3.5: 24.9 seconds 43.7 FPS (motherboard reports 233MHz)
Overclock using “auto” settings to change clock speeds
166MHz: 30.9 seconds 35.3 FPS (motherboard reports 166MHz)
200MHz: 28.1 seconds 38.8 FPS (motherboard reports 200MHz)
233MHz: 28.3 seconds 38.6 FPS (motherboard reports 200MHz)
266MHz: 31 seconds 35.1 FPS (motherboard reports 166MHz)
300MHz: 31.4 seconds 34.8 FPS (motherboard reports 166MHz)
333MHz: 27.7 seconds 39.3 FPS (motherboard reports 200MHz)
Where am I?
