Bad IMC in 3570K?

morbiD

morbiD

morbiD

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Joined
20 Feb 2014
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11
Hi! Hope I'm not being rude in asking for advice with my first post on these fine forums! :D

About a year ago I upgraded to a 3570K on a Gigabyte Z77X-UD3H, with 8GB of Samsung Green DDR3 (which I chose because of the reports of how well it overclocks). However, I've just now started trying to overclock the RAM and I'm not really getting anywhere with it.

My goal was 2133MHz, but starting with all the BIOS settings at default, I just cannot seem to get the RAM above 1866MHz, however much voltage I give it and however much I loosen the timings.

1866MHz seems to be stable somewhere in the range of 1.4-1.45V with stock timings (I haven't spent any time tweaking at this speed).

If I increase the speed to 2000MHz, it simply will not pass Memtest86 or SuperPi, whatever I do. I've been all the way to 1.65V, with timings significantly slackened (as loose as 13-13-13-39-2T), but nothing seems to work. I've also tried putting the IMC and VTT voltages as high as 1.1V.

Do I just have a terrible IMC in my 3570K? (I dunno if it makes any difference, but I've previously managed to overclock the CPU to 4.5GHz which needs around 1.32-1.33V of VCore under load).
 
Thanks for the suggestion, but I forgot to mention that I already updated to the F20e BIOS! That was the first thing I did before starting my overclock attempts :(
 
Well, I was previously on F18 which seems to be the latest final.

I briefly tried overclocking the RAM on that BIOS a few months ago, but had pretty much the same problem and just gave up until this weekend's attempts with the F20e.
 
Well I gave that a try - locked in the sub-timings - no difference.

Found some comments around the net that suggested messing with the new "read/write slew rate" settings in the beta BIOS - no difference.

Saw a comment that suggested disabling interleaving - no difference.

At 2133MHz, when I run Memtest86 tests 2 and 5, test 2 passes but then test 5 just spits out 300+ errors during the 1024-2048 range.
 
I don't believe it! Seems like I have a bad stick! :eek:

I had tried everything BUT putting in one stick at a time - I swapped the sticks around, I moved them to the spare mobo slots. It never occurred to me that a stick could be bad since they both worked up to 1866MHz.

Now I've just tried one stick at a time, and it seems that one stick will do 2133MHz at stock voltage, while the other won't do 2133MHz at any voltage.

That's the end of that then. I guess I can't even RMA them since they both work fine at the stock 1600MHz? :mad:
 
Cleaning didn't work either, unfortunately.

I guess there's a lesson in there somewhere about testing your hardware's capabilities as soon as you buy it :rolleyes:
 
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