So here's my dilemma; I'm currently building my girlfriend a PC based off of old parts from me. So far it has an Asus P8P67, 8gb Corsair Ven RAM, MSI GTX 570. I currently have a 2500k. Do I buy a 3570k and take advantage of my Z77-GD65 motherboard and PCI 3.0 GPU (obviously there's little to no difference gain) and then put the 2500k with the new build or do I just buy another 2500k, trouble is both are the same price. Most she'll be using it for is Photoshop, illustrator etc, as far as gaming goes probably non other than solitaire. Me I'll be doing gaming, 3D modelling with Autodesk Maya, Mudbox, Photoshop etc, I'm not spending a £100 more for hyper threading with an i7 so don't mention it, it's not worth it. Any thoughts are more than welcome 

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I'd sell the 570 and use a cheaper, quieter, less power hungry card for the usage you give in your OP.