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Weird issue - can't overclock memory through multiplier but can through BCLK

post #1 of 6
Thread Starter 
Hey everyone,

I'm hoping someone can give me some suggestions on what I might be doing wrong here smile.gif I'm trying to OC some Samsung DDR3 1600 RAM to 1866, and based on what I've read it should easily go to this speed. I'm starting with default timings (11-11-11-28) and then figured once I'm comfortable with it at 1866 I'd try lowering the timings.

The problem is that when I bump the RAM speed to 1866 my machine won't POST, or at least it sits at a blank screen for awhile, auto-reboots, tells me "boot failure detected," and resets the RAM speed to 1600. The weird thing is that if I increase the RAM speed by adjusting BCLK then it works fine, although all kinds of other stuff starts failing from the BCLK change (like AHCI). I've gotten it all the way up to 2133 via BCLK and it passed Memtest without any errors, so I feel like it should have no problem going to 1866. But every time I set it to 1866 by adjusting the multiplier, it won't POST and then I get "boot failure detected."

System specs:
Mobo: Gigabyte GA-F2A75M-D3H (A75 chipset)
CPU: A10-5800K (OC'd to 4.1GHz, stock is 3.8GHz)
RAM: 2x4GB Samsung MV-3V4G3

I've tried bumping the RAM up to 1.45V (stock is 1.35V) and that didn't help either. Any ideas?

Thanks! smile.gif
post #2 of 6
NB voltage not set high/fast enough? headscratch.gif
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post #3 of 6
Thread Starter 
Ah, I hadn't actually checked that. NB was set to Auto so I tried manually setting it to 1800, 1900, and 2000, but still wasn't able to post with the RAM at 1866 with any of those. I bumped NB and RAM voltage a little bit but that didn't help either. Thanks for the suggestion smile.gif
post #4 of 6
how far is a little? Looking at a lot of other peoples timings and such you may need upwards of 1.5v

edited for 1.5v for the sticks of RAM !

or it could be that the board can't handle it judging from the newEgg reviews. I'm no expert on products so perhaps an opinion from someone else on that.
Edited by braxsusriely - 1/13/13 at 5:31am
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post #5 of 6
Thread Starter 
Quote:
Originally Posted by braxsusriely View Post

how far is a little? Looking at a lot of other peoples timings and such you may need upwards of 1.5v

edited for 1.5v for the sticks of RAM !

or it could be that the board can't handle it judging from the newEgg reviews. I'm no expert on products so perhaps an opinion from someone else on that.

I only tried the RAM at 1.45V - since it runs at 1.35V by default and most people report getting it to 1866 at stock voltages I didn't want to push it any further. I bought the mobo right when Gigabyte released it because I've always had good experiences with their products, so there weren't reviews at that point. I went back and looked at the Newegg reviews and like you mentioned a lot of other people are having problems getting their RAM past 1600 on this board, so it sounds like that's probably the issue. Thanks for pointing that out to me, I wouldn't have thought to check that. Hopefully they'll be able to fix this through a BIOS update smile.gif
post #6 of 6
i got stuck at overclocking past 2400 on my northbridge from what i understand ( thanks OCN) is a major player in our AMD chips and that our Thubans love it. Currently i've got a mild 24/7 boinc machine @ 3.7ghz / 2800 NB and memory @ 1600. on a nice Asus M5A99X Evo board. Its relativly cheap and the MOFSET coolers and 6+1 design help increase my OC abilities a ton. I used to own the next step up from you which is now in my 2nd rig 880GAUD3H -- its got a 4 core a 1333 RAM. I mean its got its features like USB 3.0, and Sata 6gps support but it'll never be my overclocker choice.
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