Getting very low fps after installing new RAM. It wont go off even after the new RAM is removed

[Omal_V]

I bought a new 4gb DDR3 1333MHz RAM(A-data) today and installed in my PC which already had a 4gb DDR3 1333MHz RAM(kingston). The 2 RAMs were detected as 8gb and there were no visible errors or problems. Both of them were fixed to right DIMM slots and were in dual channel(CPU-Z). They have same bus speed and voltage. Only difference was the brand.
But, when I was playing games, the FPS was so low than earlier I had. Games which I got 250fps were around 40fps.(COD 4)
Then I removed my new RAM and the issue is still there. I dont know what have caused it and please note that the FPS is not constant. It goes high and low every 2 seconds like. Please help. Thanks in advance!

My rig
Core i7 2600 (no OC)
MSI GTX 770 4gb
1x 4gb ddr3 kingston and 1x 4gb ddr3 a-data both @ 1333MHz
650W PSU
60gb a-data ssd
1tb WD HDD

 

[Tradesman1]

Try with both sticks and raise the DRAM voltage + 0.05 and see if that helps

 

[ckesimli]

Maybe there was an XMP profile error in your motherboard bios. Check those.