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post #91 of 220
If I remember right, drive strength affects the strength of the signals travelling through memory. I may have this backwards, but a stronger signal aids in tighter timings, while a looser signal allows a higher mhz.

TBH, I have no idea if that's backwards...but at least now you sort of know what it does. If it's the other way around, PM me, since I'd like to recall which way is correct.
     
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post #92 of 220
So in overclocking RAM, is it better to have tighter timings? Or higher MHZ? Could anyone link me to a RAM overclocking guide? I need to brush up.

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post #93 of 220
Drive strengths really only effect sticks on a module to module basis. TCCD only likes lower DSs and pretty much everything else loves the higher ones... BH-5 is the ultimate example. The new ddr2 DS's also are trending high/middle which is a welcome change of pace. In essence they don't really affect any timings. It does have a pretty big influence on stability in general. They are essentially the amplitude of the information being pushed through the bus. (Think of the info as a sine wave being added onto the 'edge' of a bus clock cycle. The DS is the aplitude of that wave.) This is controlled by the mem controller, naturally. Higher DSs tend to heat up your ram more than lower since, after all, it's effect is slightly lower voltage.

The typical rule of thumb is that the higher the htt/FSB you can start relaxing the DSs a bit.

It's really a balancing act. I weight it toward the MHz except with BH-5. I'd call the typical importance of timings to be 25% and 75% weight toward MHz. Of course it really all comes down to your rig. If you are only stable through 270 at 3-4-4-8 with your UCCC and also stable at 2.5-3-3-7 at 250 and your Opteron 165's highest OC is 334x9 your useable dividers are at 277ish and 250ish MHz you have two options. One is drop your CPU OC down to 324x9 (2.92GHz) and keep the high divider for mem at 270 3-4-4-8. The other is to go ahead and drop the memory divider still at 344x9 and go 250 2.5-3-3-7. Now, keeping the 75% /25% importance split in mind...

You can lose 80 MHz and go for high bandwidth(75%)... or go low bandwidth and keep your 80Mhz(25%).

Now ask yourself is the bandwidth increase at twice the value of timings WORTH 80MHz cpu. It's close... very close. You'll see higher performance on each with different apps. I can nearly guarentee a higher CPu score in 06 with the CPU MHz and a higher CPU score in 05 with the higher mem. So it comes down to what you'll be using your CPU for. Transcoding? Video editing? The first I'd go CPU the later I'd go bandwidth. Gaming? I'd stick to the bandwidth because invariably the lower CPU will allow lower Vcore and lower heat and yield essentially the same performance.
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post #94 of 220
Alright, I get somewhat of what you said, I just have a few things missing and they are making this make no sense. Alright how do you calculate the MHZ of your RAM? I think because my RAM isn't the highest quality I am going to for the highest MHZ possible. Takes for explaining it Ihatethedukes. Again any guides yall got that will explain stuff for me?

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post #95 of 220
Well, if you have value ram the same exact thing applies. It's likely it's not BH-5 so shoot for the highest MHz on the CPU as possible and then if you sacrifice less then 75MHz CPU clock for greater than 30MHz ram speed go for the high ram speed and back off from your CPUs maximum clock. Otherwise stick with the maximum CPU speed.

Your ram speed is calculated by...

FSB x (memory divider) = mem speed.

So 200(stock FSB) x 1/1(standard ddr400 setting)= 200MHz ram speed

Overclocked to 3.0Ghz on a 9x CPU multi..
FSB x CPU multi = CPU speed

334 x 9 = 3000+Mhz

Okay... now put the new FSB number into the memory speed equation EXCEPT, since we know our memory can't do 334MHz we'll put it on the DDR300/150MHz/(3/4) divider.

334 x 3/4 = 250.5Mhz ~ 251Mhz

There, isn't that easy?

As for the memory OCing guide... it's pretty much on DFI-street and I can't show you since DFI-street is down.
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post #96 of 220
Quote:
Originally Posted by Ihatethedukes View Post
Well, if you have value ram the same exact thing applies. It's likely it's not BH-5 so shoot for the highest MHz on the CPU as possible and then if you sacrifice less then 75MHz CPU clock for greater than 30MHz ram speed go for the high ram speed and back off from your CPUs maximum clock. Otherwise stick with the maximum CPU speed.

Your ram speed is calculated by...

FSB x (memory divider) = mem speed.

So 200(stock FSB) x 1/1(standard ddr400 setting)= 200MHz ram speed

Overclocked to 3.0Ghz on a 9x CPU multi..
FSB x CPU multi = CPU speed

334 x 9 = 3000+Mhz


Okay... now put the new FSB number into the memory speed equation EXCEPT, since we know our memory can't do 334MHz we'll put it on the DDR300/150MHz/(3/4) divider.

334 x 3/4 = 250.5Mhz ~ 251Mhz

There, isn't that easy?

As for the memory OCing guide... it's pretty much on DFI-street and I can't show you since DFI-street is down.

Alright, that makes much more sense, thanks for clearing that up with me!
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post #97 of 220
DFI-street is back up. False alarm and it was maintainence as I said.
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post #98 of 220
Quote:
Originally Posted by Ihatethedukes View Post
DFI-street is back up. False alarm and it was maintainence as I said.
yayayay. now i get to flash my BIOS to see if it'll fix my board wooooooooooo
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post #99 of 220
YAYAYAYAYA it is back up, I am going to look over the guides on overclocking, to see if I can get anymore info.

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post #100 of 220
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