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Can I use RAM's higher than 800Mhz since I overclock?

post #1 of 15
Thread Starter 
I'm still confused but quickly learning things. I recently overclocked a lot. Like from 3.0Ghz straight to 3.6Ghz at 1.4 then went to 3.2 since I find my temps better there. My motherboard supports 800Mhz Ram but I noticed some strange things in the BIOS which makes me curious for example when we change the multiplier and core speed we as well can change the ratio to adjust the RAM's right? Like at 333(FSB) we can set the RAM to 666. And if the FSB is @ 400 the RAM can be set to 800. Will I be able to buy "4GB (2GBX2) DDR2 1066" and use it? I'm really curios since the current 2X2GB I recently bought, one of the the stick has so many errors which makes it a faulty but the other stick is perfect. Which means I can return it then get the "4GB (2GBX2) DDR2 1066" if it can work. Thank you.

Edit

Guys so I got the same replacement with my RAM's the Team Elite 800Mhz but what I noticed was something good I think! My previous which I already gave back has these timings 6-6-6-18 and what I got back was the same 800Mhz 2X2GB but the timings are 5-5-5-15 which is better right?
Edited by armen16 - 2/14/11 at 2:12am
post #2 of 15
The higher ram is fine. Even if you don't use the 1,066mhz ram {2 x 533mhz}, you can run it lower. So you are covered both ways. As it gives you a little more breathing room.
post #3 of 15
Thread Starter 
Quote:
Originally Posted by KILLER_K;12358701 
The higher ram is fine. Even if you don't use the 1,066mhz ram {2 x 533mhz}, you can run it lower. So you are covered both ways. As it gives you a little more breathing room.

Thanks for the reply. Wait so basically the RAM I stated will work on my motherboard? Which means I can still get it to a lower Mhz to make it work perfectly? That's what you meant? All I know is my motherboard said it can support DDR2 800 Dual Channel that's all I remember.
post #4 of 15
Yes it will more then likely default to the 800mhz {2 x 400mhz} mode when you install it. So you should be able to tighten up the ram timings a little. So you can gain a little performance that way also.
post #5 of 15
as long as the board supports the type (DDR, DDR2, DDR3) and its voltage, any set of ram will work. Theoriticly if u found a set a 1600mhz DDR2 (don't exist) you could use it in your board that runs 800MHz, but it will be downclocked, but u will not be limited by your ram speed when your overclocking your proc then
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post #6 of 15
Thread Starter 
Quote:
Originally Posted by KILLER_K;12358769 
Yes it will more then likely default to the 800mhz {2 x 400mhz} mode when you install it. So you should be able to tighten up the ram timings a little. So you can gain a little performance that way also.

Thanks again, that was easy to understand when people say "tighten up the ram timings" what does it exactly mean? Again I just learned how to set the timings manually since when I used these 2X2GB Ram my system was going unstable then someone told me not to put the RAM timings on Auto then I timed it from what's shown on the RAM sticker which is the default timing. But I don't get the meaning of "tightening the RAM".
post #7 of 15
Tightening the Ram is making it run on lower latencies (and thus faster) that the official specifications for that kind of ram. JEDEC sets the standard rules, and then each memory manufacturer does stock memory that works according to that JEDEC standard, or makes RAM that works faster (lower latencies), but must still conform to the JEDEC standard.

All memory must comply to the standard, even if it is high performance memory, so the computer can at least boot (some of the high performance ram is picky running at stock settings, and might not work well under stress, so you should really use it as the manufacturer says - like you experienced). You can then set the High performance timings your memory manufacturer assures the sticks can deliver, in the BIOS.

Stock DDR2 800Mhz normally comes with stock latencies of 5-5-5-18 or 5-5-5-15 at 1.8v (which is the stock voltage for DDR2 ram).

If you get 1066Mhz DDR2, you can probably run it at 800Mhz with lower latencies than a stock 800Mhz stick would do, because you have better quality memory. Something like 4-4-4-12 should be doable, probably with a slightly higher voltage, like 1.9v. Some memory manufacturers even state at what clockspeed, timings and voltage they have tested it. At other times, you have to go by trial and error until you get stable.

Hope that explains it a bit!

Cheers!
Edited by tpi2007 - 2/12/11 at 2:23pm
 
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post #8 of 15
Thread Starter 
REP+ Thanks. That was very detailed. I also had something very similar from what I was thinking. Just like processors. The manufacturer says it can reach only to a particular volt and not above it or it will be unstable.

I'm planing to replace my RAM's with these..
http://www.tipidpc.com/viewitem.php?iid=8520402
Since this is the seller I brought from. I can't refund but these RAM's look really good. Let me know if its good. Since the one I use is 6-6-6-18. And one stick is faulty so I'm not using both sticks at the moment. Using my old Kingston RAM.
post #9 of 15
Yes excellent.
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post #10 of 15
Thread Starter 
Wait I think this is better since he doesn't have stocks of the recent one I posted. So is this better?
http://www.tipidpc.com/viewitem.php?iid=8692250
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