So I upgrade to a 460 from my old 9500, and for some reason older games (Sins included) run at an atrociously slow rate. Using the MSI Afterburner OSD, I saw that the clock didn't even increase on idle in these games.
Games affected include:
Sins of a Solar Empire
Bioshock
Bioshock 2

In these games I get around 10 fps...which is slower than what my old 9500 could get (around 30).

However, in Battlefield: Bad Company 2 I can get 50-60 with 32xAA, 16xAT, max on everything.
Intel Core 2 Quad Q8200 @ 2.33 GHz
4 GB DDR2 RAM (hell yeah, DDR2)
EVGA 460 GTX OCed to 1.037V, 1720 on shader, 2220 on memory (this is all perfectly stable, I was getting ~40 fps on BF3 without any hiccups)
oh and my PSU is 650 with 38A on the 12V rail.

I tried wiping the drivers again and reinstalling, framerate remained unchanged; resetting the overclock didn't work either.

Also, another weird thing is that on the loading screen for Sins everything runs at 60 fps but once I actually get into a game then the whole thing goes to ****.

Any ideas on what the problem might be?