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Yeah, I'll probably pick up a new mobo if I can find one for a decent price. Which mobos do you guys recommend? I'll keep an eye out on them. Also is there really no mobo that has a real legit Sata III port? Seems to all be this shoddy marvell one even for the high end ones.

Tried enabling just 2 cores and setting the bclk to 170. No boot. This guy on reddit claims to have a x5650 with the same board at 4.0Ghz. That would mean a bclk of 200 and a multiplier of 20. Too bad I don't got another mobo to test the CPU.

Lol yeah. It does run fine at stock and also runs fine with the bclk at 160 with turbo boost. Hmm this gives me an idea, I'm gonna try just enabling fewer cores and see if I can increase the bclk.

Already have that enabled. Only does a boost and not a lock for me. Also my BIOS is black and white so it seems like I have a different revision. Also don't have that "Enhanced Power Slope" setting.

This board doesn't allow me to lock the multiplier at 26. I can only enable turbo boost so it is able to boost to 4.0Ghz when needed. I put all the voltages at the maximum that is recommended and it still won't boot into windows. I was able to find this thread Intel DX58SO x58 1366 Thread on...

Welp. Tried bios versions 5600, 5599, 5561, 5559, 5529, 5506, 5456, 5200. None of them allow me to have a Bclk over 160Mhz. Also tried the limited QPI settings I have, nothing. Seems like the mobo is really limiting my cpu. They probably forgot about the x5675 in their updates. Bummer.

Interesting. I never played around with the QPI stuff. I'll give it a shot and report back.

Tried a ton of random things over the past few hours and still can't get Bclk above 160. Won't even boot into windows with a Bclk of 200 and a multiplier of 12. I'm gonna try downgrading the BIOS to see if it helps. Seems like intel has a history of capping your overclock with this board (DX58SO...

Thx primetime. It seems to be under control atm. No more blackscreens and I can boot into windows. The problem I'm having now is with overclocking. I can't seem to get a Bclk above 160. Anything above that number it won't boot into windows. What's weird is i was able to hit 170 on my i7940. I...

Wow just got it to boot into windows for the first time. I lowered the memory speeds the lowest they can go and was able to get it to boot into windows. Something odd is happening.

I made sure I had the latest BIOS before installing it. The BIOS does recognize it but I can't get it to boot into windows. After leaving it alone for a bit to do some research I came back to it and can now consistently get into the BIOS. wtf lol?

Finally received my x5675 today. Unfortunately, it is not going smoothly. I installed it and when I try to boot all I get is a blackscreen. Occasionally, I am able to get into the BIOS after pulling the plug and hitting the switch on my power supply. In the bios I restore the default settings...

What overclock speeds do you have for it?

$190 for a W3690. Too expensive lol.

Interesting you might be on to something. Looking at the seller's profile there are 5 other xeons that are just as dirty with writing on them and uncleaned thermal paste. Surprising they didn't even take the time to clean it.

Why is there thermal paste on the back to begin with? Does it have something to do with how the servers are setup? Judging from interior pictures of servers there doesn't seem to be a CPU cooler anywhere.

So I just got one off ebay that was from a floor HP Server. I should be fine right? Hopefully the back is just dirty and that's not a scratch. It looks pretty beat up.

Doing some research around the web I found other people are saying that they are not as good as retail chips and are less likely to be good overclockers. Also something about the extreme stress the are put under due to it being an ES which would effect longevity.

Damn, so that's what it stands for. Thanks, very helpful. What's confusing is that this listing says ES and B1 lol.

Are there different stepping versions for X5675? Wiki says there is only B1 but I see some ES versions on ebay. Any difference?

Awesome to hear. The only thing X58 platform doesn't have is a legit Sata III port. Sure there is no real world difference between Sata II vs Sata III, but I do a lot of 3D work and it seems the scratch disk isn't utilize to its full potential.

Nice, I'll probably play it safe and go for the X5675. Thanks.

That's insane. Seems like you won the silicon lottery. Over at hwbot, the average for a X5650 is 3.8Ghz.

Hi guys, I currently run a i7-940 C0 overclocked to 3.75GHz. I was wondering which X58 XEON to get that is the best bang for the buck? I was looking at X5650, X5660, X5670 and X5675. Is there a de facto one I should get similar to the i7-920 that has a lot of overclock room? I'm planning to...