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3570k to 2600k worth it?

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I'm looking at swapping my existing 3570k for an i7. Originally I was only looking at a 3770k but I was wondering if something like that might be worth checking out assuming I can get one cheap enough. Now I have to run one of my cards in the bottom pci slot at pci-e 3.0 x4 (so the same as 2.0x8 I believe) and then top one at x16. Will there be a noticeable slowdown since the 2600k doesn't support pci-e 3?
 
Not really notice it for single GPU.

There is one other thing the 2600k does not have that the Ivy does, think its an instruction set but cannot remember 100% TBH.
 
No it's one at pci-e 3.0 x 4 which is the same as 2.0 x 8 and the other card is in my top pci -e 3.0 x16 slot which I would imagine is down to x8 with the 2nd card being plugged in but I forgot to check actually. Was more concerned with temps which are fine when the cards are this far apart. There's been a hit in 3dmark but not noticed anything in gaming.
 
I went from a 3570K at about 4.5Ghz to a 2600K at 4.6Ghz and it feels like it runs the games smoother...though heaven benchmark did drop by about 30 points.
 
No it's one at pci-e 3.0 x 4 which is the same as 2.0 x 8 and the other card is in my top pci -e 3.0 x16 slot which I would imagine is down to x8 with the 2nd card being plugged in but I forgot to check actually. Was more concerned with temps which are fine when the cards are this far apart. There's been a hit in 3dmark but not noticed anything in gaming.

Are you sure about your PCI slot speeds. According the MSI website the bottom PCIe 16x slot runs at 4x Gen 2.

http://uk.msi.com/product/mb/Z77AG43.html#hero-specification

You can check using GPU-Z, though make sure to use the mini stress test that is included to make the slots run at their max speed.

If it is true I would look into a mobo upgrade before anything else as I am fairly damn sure that PCIe 4x gen 2 will degrade performance with 2 high end cards.
 
It's actually the G45 I have but it still says it's pci 2. I dropped 500points in fire strike extreme but made it back since I could actually overclock these cards now they are far enough apart not to overheat. I've had a look but couldn't see many boards that had appropriate slots with enough space that weren't £200 workstation boards.

EDIT: Heres what GPU-Z says about the cards.



 
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I have a 2600k and run at stock speeds and is fine for gaming, i have a 7990 and rarely see the CPU usage go over 30% but on games like arma 3 it goes to 50% as it can't use hyper threading.
 
I got a decent deal on one so I picked it up thinking I could re sell it later and lose very little in tying it out. I'd like to pick up a cheap board but the problem is finding one that has the third pci-e lane as x8 as using the top two would give me that but the cards just run awful warm.
 
So did a comparison in firestrike extreme between my original score and the difference if I moved the cards into x8x8

so it went from 8116 to 8721. It also topped out at 93 degrees witrh my fans at full and the side off. Clearly unusable but it does show the difference if my board had an extra x8 slot at the bottom

That's what I mentioned in the 290 thread. Goes to show just how much a board with a third x8 slot would be the business.
 
been wanting to know the same thing myself, I have SLI and the i5 is bottlenecking the cards slightly plus the lower temps of sandy vs ivy would interest me
 
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