Random Reboot

[Gelf]

I just installed a radeon 9700 non-pro and now when I play wc3 it'll reboot at some random time. Sometimes it won't sometimes it does, but it's always in WC3 never in anything else, it didn't crash in 3dmark2003 and doesn't crash when I play SOF2. Nothing's been overclocked. It's fucking annoying. I thought my PSU couldn't handle it but my 5v line is 4.97 at idle. So I dunno what's going on. I tried different RAM and that didn't work either.