Hi there, I was looking to upgrade my PC again and I think it's now time to spend some $ into a new CPU. Here's my current system configuration: OS Microsoft Windows 7 Ultimate Version 6.1.7601 Service Pack 1 Build 7601 Processor Intel(R) Core(TM) i3 CPU 540 @ 3.07GHz, 3725 Mhz, 2 Core(s), 2 Logical Processor(s) Motherboard ASRock H55M-GE Display NVIDIA GeForce GTX 560 BIOS Version/Date American Megatrends Inc. P1.30, 10-08-10 Installed Physical Memory (RAM) 8,00 GB Total Physical Memory 7,99 GB Available Physical Memory 4,74 GB Total Virtual Memory 16,0 GB Available Virtual Memory 12,2 GB I want an Intel i7 but I don't have 500 bucks to spend on it so I was looking through the used ones on eBay. I have a budget around 150-200$ max. I found these which seems interesting but I have no idea if they would fit in my current system configuration and/or if I need the fan and heatsink since I already got those with my i3 CPU: http://www.ebay.ca/itm/Intel-Core-i...3cf5090d1f&clk_rvr_id=827779067325&rmvSB=true http://www.ebay.ca/itm/Intel-Quad-C...3cf9118699&clk_rvr_id=827786837412&rmvSB=true Can anyone tell me if this is a good idea or suggest something else? Thanks in advance!