I5 2500k vs i5 3570k

Depends, you're not stating anything else.

There are too many factors.  

There really isn't that much of a difference. The Ivy Bridges CPU's is slightly faster and has better graphics but if you're gaming than that really doesn't matter. Ivy Briges CPU's do run a little hotter than Sandy Bridges because Intel decided to use thermal paste to "glue" down the heat spreader instead of fluxless solder. Desipite that you can still get a very good overclock with Ivy Bridges as long as you have good cooling.

I would go for i5-2500k if overclocking hardcore if not i would go for i5 3570k

I would get the i5 3570k for PCI-e 3.0 support among other things. If your OC is over 4.5 GHz only then would I consider the i5 2500k but you have to ask whether this sort of OC is necessary for your use. (I love my Sandy but I think the $10 is worth it)

Also keep in mind that the 2500k will use 20-30W more than 3570k so paying $10 extra for IB will pay for itself over time through slightly lower power and cooling bills.

Please come help me talk sense into this person wanting to watercool http://www.tomshardware.com/forum/351051-28-which-liqui... they won't read the sticky

2500k is capable of being the better cpu if heavy overclocking is involved. it will also do it a lot cooler, and has proven itself as a workhorse, capable of doing such a thing without burning out. ivybridge runs a lot hotter and doesnt overclock as well. it also hasnt proven itself for the long term in heavy overclocking situations.

i prefer the 2500k personally.

on the other hand, a 3570k uses less power and has a better onboard gpu. has a slightly better ipc in some situations (though not all, it even loses in some.) really depends what you want from your cpu. in all reality, theyre pretty close.

Hmm All right guys, Thanks for all the replies. I have a gtx 660 ti and I might Sli them later. Would either of these processors be able to pull everything out of those two cards?Please and Thankyou  

No both cpu could handle any cards currently even sli gtx 690 would not bottleneck no worries!

Ok so should I go for 3570k? How much can you oc 3570k? I know that every chip is slightly different but whats the average overclock on 3570k? And also would pcie 3.0 make any noticiable changes in fps?

pci-e 3.0 will make no difference. 4.5ghz is a good overclock for an ivybridge. 4.8 is a good overclock for sandy. ivy@4.5ghz will run hotter than sandy@4.8 though. intel says ivy is designed to run hotter though

With a 660ti, overclocking your CPU is unlikely to help gaming that much. The 2500k/3570k is the best CPU on the market so if you can afford it get it. An OC of 4.3 is pretty good and should be achievable at near stock voltage.

I personally prefer the i5-2500k but some prefer the i5-3570k i have not been able to overclock my very far without it getting to hot and no pcie 3.0 does not make any changes in fps as far as i can tell

Right now it really doesn't matter. Games don't even Max out PCI-e 2.0 bandwidth right now let alone PCI-e 3.0.