Sadly for Nehalem owners, Sandy brought massive gains over the previous generation.
I think those gamers who adopted Sandy Bridge early enough are very fortunate, and I can't see myself replacing a 4.5GHz 2500K anytime soon.
I was lucky enough to grab a 2500k early at a great price, though I did as the poster above says, upgrade the motherboard from a P67 to a Z77, but I am sitting at 5.1 now and under 1.5v, so I am very happy, I only got to 4.8 on the P67.
I have been debating getting a shiney new z77 motherboard to cradle my precious 2600k since it is sitting in a Gigabyte P67-UD4-B3. Unfortunately I have a OEM windows 7 64bit license. So on top of the price of the motherboard I need to get another Windows license . I have a spare g-530 celeron lying around that I could use to make another system with the p67 motherboard and a HD 6450 I have lying around could combine to make a nice snappy machine. So I guess I will be waiting on the need for a new system where the G-530 will suffice before I do anything.
Also my cooling 120mm AIO radiator is just over 3years old and it needs to be replaced, the radiator is aluminum and the cold plate is copper,so I would imagine it should have some corrosive buildup in either the radiator or on the cold plate micro channels or both. I mean it does a pretty good job keeping my CPU under between 60-70c on Intelburn since that makes the CPU hotter then Prime95 that will only bring my CPU up to 65c where Intelburn will rise above 65c hitting 70c on core #1. I think it is because of the positioning on the chip but the 2 center cores, core #1 is the hottest with core #2 is a close second. My coolest core is core #0 running around 8c cooler, and core # 4 is the second coolest running around 5c cooler then my hottest core under a full load.
2600k@4848mhz @1.4v CM Nepton40XL 16gb Ram 2x EVGA GTX770 4gb Classified cards in SLI@1280mhz Stock boost on a GAP67-UD4-B3, SBlaster Z powered by TX-850 PSU pushing a 34" LG 21/9 3440-1440 IPS panel. Pieced together 2.1 sound system