I used to do that test with a mobile pentium from back in the day... I think it was a T5600? The model name sounded like a terminator, that's for sure. Problem

I used to do that test with a mobile pentium from back in the day... I think it was a T5600? The model name sounded like a terminator, that's for sure. Problem is that then AVX became a common thing (at least in part of what I run) so that processor became unusable. I moved to an i3-3120m, which supports AVX, but then AVX2 became a thing. I could've gone for a 4000-series i3 at that point, but I just grew tired. And Pentium/Celerons are a bigger mess to find because some of them are Atoms now. For example, I have a N4000 sub-notebook that I got for my mom to check her email and view online videos, and the things feels pretty snappy for those things. But then you try to run some numerical code and you find it's 50-100x slower than their bigger siblings... Turns out it has no AVX of any kind, and event though it says it supports SSE4, it feels possibly slower than the older Pentium I mentioned at the start, even with faster, dual-channel memory, and those old Intel didn't even have SSE4, just SSE3. But possibly at that point the 35W thermal headroom of theT5600 plays a big part as the N4000 is passively cooled and has a 6W TDP. Moral of the story? Even if you try to, it's hard to pick a slow/old processor that will support all the operations that your software could use. Some of the give a huge speedup. You have to pick your battles. You'd probably have an easier time underclocking a lot out of your current processor (and disabling a few things?) and call it a day for performance testing.