3770k - fully unlocked. Newer socket. More efficient.

3820 - more PCI E lanes, supports quad channel memory, higher stock clock speed, bigger L3 cache.

They'll perform roughly the same - unless you're going to be using SLI, as the 3820 allows for 16+16, however it doesn't honestly make much of a difference.

I would personally go with the 3770k as there is a larger choice of motherboards, and new ones with more features are still being released.

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edit

With the 3770k you get a fan included, and a very good motherboard will cost about ~130 USD. Of course, you'll be overclocking, but because of the lower cost of the motherboards, you'll be able to get a really nice heatsink+fan.

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I strongly advise against buying into socket 1155 right now because new CPUs and boards are being released in a few weeks.

Otherwise, the 3820 is faster and I'd only suggest it for gaming if you will be using more than two graphics cards. Sandy Bridge-E CPUs have more PCIe lanes available. The 670 and 7970 are much better buys than the 680 as well.

r00t wrote I strongly advise against buying into socket 1155 right now because new CPUs and boards are being released in a few weeks.

Otherwise, the 3820 is faster and I'd only suggest it for gaming if you will be using more than two graphics cards. Sandy Bridge-E CPUs have more PCIe lanes available. The 670 and 7970 are much better buys than the 680 as well.

My mother board uses 1155 sockets
my motherboard is an ASUS P8Z77-V LX

iProV1PeR wrote

r00t wrote I strongly advise against buying into socket 1155 right now because new CPUs and boards are being released in a few weeks.

Otherwise, the 3820 is faster and I'd only suggest it for gaming if you will be using more than two graphics cards. Sandy Bridge-E CPUs have more PCIe lanes available. The 670 and 7970 are much better buys than the 680 as well.

My mother board uses 1155 sockets
my motherboard is an ASUS P8Z77-V LX

What CPU do you already have?

r00t wrote I strongly advise against buying into socket 1155 right now because new CPUs and boards are being released in a few weeks.

Otherwise, the 3820 is faster and I'd only suggest it for gaming if you will be using more than two graphics cards. Sandy Bridge-E CPUs have more PCIe lanes available. The 670 and 7970 are much better buys than the 680 as well.

i thought the new cpus will have a different socket 1150?
i would go for the 3770k

Yes the new series of Intel processors will be using the 1150 socket. It is expected that after release, prices of 1155 processors will drop.

r00t wrote

iProV1PeR wrote

r00t wrote I strongly advise against buying into socket 1155 right now because new CPUs and boards are being released in a few weeks.

Otherwise, the 3820 is faster and I'd only suggest it for gaming if you will be using more than two graphics cards. Sandy Bridge-E CPUs have more PCIe lanes available. The 670 and 7970 are much better buys than the 680 as well.

My mother board uses 1155 sockets
my motherboard is an ASUS P8Z77-V LX

What CPU do you already have?

sorry about that slow reply, my internet went down.
and the CPU i have now is an i5 3570k

iProV1PeR wrote

r00t wrote

iProV1PeR wrote

r00t wrote I strongly advise against buying into socket 1155 right now because new CPUs and boards are being released in a few weeks.

Otherwise, the 3820 is faster and I'd only suggest it for gaming if you will be using more than two graphics cards. Sandy Bridge-E CPUs have more PCIe lanes available. The 670 and 7970 are much better buys than the 680 as well.

My mother board uses 1155 sockets
my motherboard is an ASUS P8Z77-V LX

What CPU do you already have?

sorry about that slow reply, my internet went down.
and the CPU i have now is an i5 3570k

There would be very, very little benefit from upgrading from the 3570K. Only a few games can take advantage of the extra threads offered by the 3770K and even then, the difference in performance is fairly small.