VOGONS


First post, by Zaphod Beeblebrox

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Hey friends, I've been tinkering with both emulators almost all the weekend and was wondering if these results are normal.

My PC can run an emulated PII 450 at 100% speed on PCemv17 in Windows 98SE and most games (for some, more demanding games I tweak the speed to 350 or 300 if needed to maintain 100% speed).
I had to pin the PCem threads away from the i7 E-Cores to achieve this, but after that is smooth sailing. Very happy with the results.

However I can't achieve even close to that in 86Box, the best I can do are Pentium MMX 200-233, maybe PII at 233-266 but that's almost entering choppy territory. I understand 86Box is more focused on accuracy and less reliant on "hacks" than PCem, and accuracy comes at a cost, of course. But can the difference be really this much? Normally I take YouTube videos with a grain of salt, but I saw some (particularly Phil's videos) running much better than I with similar configurations. Oh, and I tried all versions available of 86Box, stable, dev old and new recompiler, pinned the threads off the E-Cores, didn't seem to make a difference.

This thread is not to throw shade on either project, I'm very supportive of both. Mostly I was looking to clear this since I'm a bit confused.

Thanks in advance, sorry if this has been asked a million times.

Z.

"Hail the Omnissiah!"

Reply 2 of 4, by Zaphod Beeblebrox

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DosFreak wrote on 2026-02-08, 20:32:

It would be better to ask the devs of 86box on their github site instead of on a forum which may or may not be visited by them.

I'm sorry, you're absolutely right. I'm already in talks with the devs over their channels.

"Hail the Omnissiah!"

Reply 3 of 4, by Norton Commander

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Zaphod Beeblebrox wrote on 2026-02-08, 19:34:

My PC can run an emulated PII 450 at 100% speed on PCemv17 in Windows 98SE and most games (for some, more demanding games I tweak the speed to 350 or 300 if needed to maintain 100% speed).
I had to pin the PCem threads away from the i7 E-Cores to achieve this, but after that is smooth sailing. Very happy with the results.

What does "pin the PCem threads away from the i7 E-Cores" mean? I set up a PII 400 in PCEM 17 and it struggled on my i7 7700HQ Windows 10.

Reply 4 of 4, by Zaphod Beeblebrox

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Norton Commander wrote on Today, 14:50:
Zaphod Beeblebrox wrote on 2026-02-08, 19:34:

My PC can run an emulated PII 450 at 100% speed on PCemv17 in Windows 98SE and most games (for some, more demanding games I tweak the speed to 350 or 300 if needed to maintain 100% speed).
I had to pin the PCem threads away from the i7 E-Cores to achieve this, but after that is smooth sailing. Very happy with the results.

What does "pin the PCem threads away from the i7 E-Cores" mean? I set up a PII 400 in PCEM 17 and it struggled on my i7 7700HQ Windows 10.

E-Cores are lower clocked, "energy efficient" cores. You basically tell the given application to avoid using those (with something like Process Lasso) or just disable them at the bios.

The i7 7700HQ doesn't have E-Cores so it doesn't matter in your case.

"Hail the Omnissiah!"