Time to dig up this thread, I just upgraded to the new Intel Sandy Bridge processor and did some very preliminary testing last night.
Here is what I have:
Core i5-2500 (3.3 Ghz stock)
Intel DH67CF Mini ITX board
4 GB Ram
MSI HD 5670 video card
Windows XP 32 bit SP3
I only tested a couple games, but everything ran really good.
I fired up Mace: the Dark Age and played it through to the end. The framerates never dropped below 100% and game ran perfectly.
Next up, Gauntlet Legends. The game played very well with only a couple frame rate drop to 90ish% on the first stage of the mountain world. For some reason I didn't have sound effects (the music worked fine), but that may have been due to the older version of MAME I was using or mismatched CHD/ROM files. I will get a newer version of MAME tonight and do some more testing.
I would have done more benchmarking, but I was having too much fun playing Mace the Dark Age.

So my very early thoughts are that the new Sandy Bridge CPUs are going to finally make almost all of those CHD games playable without overclocking. With an unlocked Sandy Bridge CPU, overclocking is as easy as just changing the CPU multiplier in the BIOS. So far the tech sites are saying 4.0 Ghz OC can be achieved very easily on air with the stock Intel cooler. These are the perfect CPUs for MAME and with 64-bit Windows MAME performance would be even better.
Nest up, I need to find a PCI-e vid card that is compatible with Soft 15Khz so I can test games running at their native resolutions with my NEC XM29.
