Help with my ram sticks 2 4gb ram sticks?

burn and boot from a memtest CD, but you sir were probably right with your testing... Looks like a stick of RAM is giving up. This will help with making sure.

I can think of a few common issues when adding RAM that is related to your experience now.

- RAM must be from the same LOT when purchasing. So when I upgrade a customers PC, I always recommend they take out any old RAM and buy all new. Even similar types from the same company can have subtle differences that interferes with efficient use.

- When you add RAM, your Windows SWAP file will fragment and slow the computer down. You must defrag the drive, delete the swap file (aka Page File) and then allow it to be recreated as a single file on next boot. However, Optimal performance will come from a complete reload of Windows from scratch.

- The BIOS needs to be "jarred up a bit" sometimes when change out system memory. Often setting to factory defaults, rebooting (fully into OS). Then powering off, wait 30 seconds and turn it back on. Finally, reset all necessary parameters and restart 1 last time.

- Ensure you used an ESD strap (properly) when you inserted the RAM. Failure to use an ESD strap or equivalent anti-static technique usually results in damaged components that can run slower than before, if at all. Remember: static electricity that jumps off of your finger onto a doorknob can easily exceed 35-45K static volts of electricity whereas only approx 100 static volts (not seen nor felt) can fry or erase electronic components.

Are you running Win 7 32bit or Win 7 64bit?

Is the mobo dual channel? Is the memory Dual channel?