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DDR2 Overclocking with a P5N-E

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  • Memory
  • Overclocking
  • RAM
  • CPUs
Last response: in Overclocking
January 21, 2011 4:59:11 PM

My motherboard/ram/CPU combo has been aging a bit (2007 era), so I figured I would overclock it and get some more life out of it before I replace it. I have my Core 2 Duo handsomely overclocked from 2.66ghz to 3.2ghz, not as far as the core 2 duo could go mind you (I have read it could go up to 4ghz!) and my CPU temps show it could have more room, but eh, I was satisfied. I couldn't get my ram to overclock though. No matter what I try, it's stuck at 800mhz. I learned that my board (Asus P5n-e SLi) wasn't very fond of ram overclocking, but it was fixed in an update, so I flashed the bios. No change! I tried changes voltages, unlinked and linked modes, on and on, I don't know what I'm doing wrong. Can someone help? On top of getting the ram overclocked, if there is any suggestions on more CPU overclocking I would very much like to hear them.


Stats:

Asus P5n-e SLi (Award Bios updated to latest version)
Core 2 Duo E6750 2.66ghz (overclocked to 3.2ghz, 8x multiplier with 400FSB***)
4GB of Corsair XMS2 DDR2 800mhz ram (4-4-4-12 timings)
BFG Geforce 275 GTX OC (overclocked of course :D )
Windows 7 64bit

***Note that my motherboard shows the FSB at 1600, not 400. But 8 times 1600 is obviously not 3.2ghz, so 400 is the real FSB apparently. *shrug*

More about : ddr2 overclocking p5n

a c 204 } Memory
a c 141 K Overclocking
a c 321 à CPUs
January 21, 2011 5:17:44 PM

I have the same ( or similar) RAM. Mine is overclocked to 900mhz ( 1:1 ratio at 450 FSB ). All I did was keep the stock 2.1v and loosen the timings to 5-5-5-15.

You do not need to overclock your RAM at 400FSB. That links the FSB and RAM at 1:1 ratio. Keeep it stock at the tighter timings of 4-4-4-12.
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January 21, 2011 10:50:09 PM

Well, I tried a billion different things. I was going to try to start at 900mhz (via 450fsb and 3.6ghz on the CPU) on the ram and creep up. I have seen the CPU overclocked way farther, so I figured it wouldn't be a factor. But no matter what, 900mhz always failed. Voltages, timings, anything. I even tried unlinking so the CPU so it wasn't a factor, 3.2ghz on the CPU and the ram at 900mhz, but that was even worse.

Shooting a little lower, I was able able to eek it up to 425FSB for 3.4ghz on the CPU and 850mhz on the ram. It went through Passmark and 3Dmark Vantage just fine, but something about DVDs screwed it up. I don't know why, but firing up a media player and running a DVD killed it every time. So I had to back it off :(  .

Anyway to get 3.4ghz and 850mhz more stable? Currently running stock timings (4-4-4-12) with stock voltages (2.1v on the ram).
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a c 204 } Memory
a c 141 K Overclocking
a c 321 à CPUs
January 22, 2011 4:43:28 AM

MaJoRoesch said:
Well, I tried a billion different things. I was going to try to start at 900mhz (via 450fsb and 3.6ghz on the CPU) on the ram and creep up. I have seen the CPU overclocked way farther, so I figured it wouldn't be a factor. But no matter what, 900mhz always failed. Voltages, timings, anything. I even tried unlinking so the CPU so it wasn't a factor, 3.2ghz on the CPU and the ram at 900mhz, but that was even worse.

Shooting a little lower, I was able able to eek it up to 425FSB for 3.4ghz on the CPU and 850mhz on the ram. It went through Passmark and 3Dmark Vantage just fine, but something about DVDs screwed it up. I don't know why, but firing up a media player and running a DVD killed it every time. So I had to back it off :(  .

Anyway to get 3.4ghz and 850mhz more stable? Currently running stock timings (4-4-4-12) with stock voltages (2.1v on the ram).



Did you loosen the RAM timings? 2.1v and 4-4-4-12 is already overclocked for DDR2-800. Stock would be 1.8v and 5-5-5-15. I kept the 2.1v and went with 5-5-5-15 for 900mhz. I have Corsair RAM. Keep 2.1v and loosen the timings to 5-5-5-15.

You may just have a motherboard, CPU or RAM that does not like being overclocked.
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January 22, 2011 3:27:57 PM

My memory's stock is 4-4-4-12 (low latency ram ftw), and the motherboard automatically set it to 2.1v. *shrug* Besides, I already tried changing voltages and timings, it wouldn't reach 900mhz.
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