Poor performnace with un stability

[qaslam]

Hello,
I've purchased the following CPU and RAM for motherboard asus p7p55d-deluxe under the assumption that they would work great together.
Was my assumption incorrect? CPU - Intel Core i7-860 Model BX80605I7860 RAM - OCZ 8GB (4 x 2GB) 240-Pin DDR3 S DRAM DDR3
1600 (PC3 12800) XMP-Ready Rev.2 Model OCZ3X1600R2LV4GK(specially designed for 55p boards) I've gone into the bios and turned on XMP/Profile-1 and it loaded
the correct ram timings (1600Mhz with 8-8-8-24 timings at 1.65V) but the system is still unstable stable when running games or routine work. Please advice for perfect stability and performance.
Thanks

 

[ekoostik]

Is it stable at 1333 MHz when XMP is turned off? Have you run memtest86+ overnight? http://www.memtest.org

I would turn off XMP and set the memory timings and V by hand.

Since you've got 4 sticks, you may need to up your Vtt aka IMC voltage. Try setting it to 1.21V, if that's stable, then you can back it down until you find the point at which it's not stable anymore. Typically you'll read that Vtt should not be any less than DRAM V - .5. So with you're sticks at 1.65 you should probably be at at least 1.15. I picked 1.21V as the starting point becaue according to Intel's spec sheet that's the 'absolute max' although you'll often see suggestions to push much higher for OC stability, such as here: http://www.bit-tech.net/hardware/cpus/2009/09/21/overclocking-intel-s-core-i5-750/2