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General LGA 775 and DDR2 Overclocking Advice Needed and Appreciated!

post #1 of 11
Thread Starter 
Hello! I am brand new here, but I have been overclocking for quite a while now, even if not that seriously.

I am going to upgrade my GPU soon from a 4870 to a 6970 to help with the newer games coming out, BF3 namely. Only problem is that I am doing this on a LGA 775 motherboard, and I want to get another year or so out of it before I swap out to the i series motherboards.

I have a Gigabyte GA-EP45-UD3P with 2x2GB for 4GB of 800 MHz DDR2 Corsair RAM (CM2X2048-6400C4DHX) which has stock 4-4-4-12 timings at 2.1V. I run my current budget dinky processor (E7200, rated at 2.53 GHz) at 2.95 GHz after just minor bios overclocking efforts with ram timings of 5-5-5-15 and an effective FSB of 1244 MHz according to CPU-Z (311 MHz Bus Speed with 9.5 multiplier).

That all aside, my main question is: Do I have to get faster memory if I were to get a Q9650 off of eBay, which runs at 1333 MHz FSB? I'm guessing no, but will I not be able to overclock it at all with my current PC6400 RAM? I've been out of the game too long to remember how all the ram timings, effective FSB, and overclock tweaking in general works.

Also, will my current E7200 Core2Duo @ 2.95 GHz bottleneck the 6970 severely?

Big thanks to anyone who takes time to help answer my questions! I have googled around extensively, but I have found no clear or easy answers. I'm hoping I can get some of my confusion cleared up here
Edited by Monkeyclaw - 10/16/11 at 1:01pm
post #2 of 11
You don't have to get faster memory, you can just change the memory divider if you need to overclock your processor further.

Your processor will probably be a bottleneck in BF3. A quad core would be a nice upgrade.
post #3 of 11
Thread Starter 
Yes I was thinking that too, problem is that Newegg (and everywhere else) still has their Q9650s at about the same price they were 2 years ago (340? cmooon!) so I'll probly get me a nice used one for value.

I am not worried about overclocking my current processor anymore, but I am curious: what is my FSB with my current RAM? its not 1333 is it? and will having RAM and CPU FSB not be 1:1 effect performance much, or does that not matter as much anymore?

Thanks for the quick response!

BTW: I also Fold on this machine with a normal CPU and GPU client running almost all the time. I get about 2500 PPD with my 4870, and only 250-500 PPD with the other half of the CPU being used by default CPU client. I wish ATi got better PPD for the buck, but I still do okay in rankings from earlier days lol...
Edited by Monkeyclaw - 10/16/11 at 1:11pm
post #4 of 11
Yeah, get a used one, hahaha.

And using 800mhz memory will only affect overclocking at higher FSBs. If you're at 400 FSB and 1:1 on memory, your memory will be at 800mhz. If you raise the FSB any higher you'll start overclocking your memory, which will lead to instability.

(At least that's how it worked on my 750i board...)
post #5 of 11
Thread Starter 
Quote:
Originally Posted by CHUNKYBOWSER View Post
Yeah, get a used one, hahaha.

And using 800mhz memory will only affect overclocking at higher FSBs. If you're at 400 FSB and 1:1 on memory, your memory will be at 800mhz. If you raise the FSB any higher you'll start overclocking your memory, which will lead to instability.
So you are telling me that my memory running at a 1244 Rated FSB is already at a 444 MHz overclock? Or do you multiply something in there because of Dual Channel and all that... My CPU/RAM overclock is pretty rock solid, I have little to no stability issues due to CPU/RAM as far as I can tell (occasional video card/graphic driver issues have much more often been the culprit of any lockups/crashes).

Also, is the Rated FSB what I look to match with the 1333 FSB of the Q9650 or is it something else?

Thanks again for all your help, and sorry if these answers seem obvious. I used to be sure of how all of this works, but my system is about 3 years old now, which means its been 3 years since I really had to know all of it
Edited by Monkeyclaw - 10/16/11 at 10:54pm
post #6 of 11
1244 FSB = 311 (FSB=4 x Bios setting for cpu) FSB is called quad pumped ie 4 x ???
so DDR2 @ 1:1 would be 311 x 2 so 622Mhz. DDr2 is 2 x ???

so 1333 FSB = 333.25 (reported as 334)
DDR2 @ 1:1 would be 667Mhz

so still plenty of room on DDR2-800 (PC6400)
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post #7 of 11
Thread Starter 
Quote:
Originally Posted by aramil View Post
1244 FSB = 311 (FSB=4 x Bios setting for cpu) FSB is called quad pumped ie 4 x ???
so DDR2 @ 1:1 would be 311 x 2 so 622Mhz. DDr2 is 2 x ???

so 1333 FSB = 333.25 (reported as 334)
DDR2 @ 1:1 would be 667Mhz

so still plenty of room on DDR2-800 (PC6400)
Okay awesome, that's what I was looking for. I saw that the Rated FSB was x4 what my memory was running at, so I figured there was a 4x multiplier in there somewhere but didn't know why.

So this means my memory is currently running at 311, and its rated to run at 400 MHz (DDR2 800 = 2 x 400) and that means my memory will not trouble me at all in overclocking a Q9650 when it has all that headroom past the 1:1 334 speed (since the memory is rated to go 400 MHz).

All very crisp now. Looks like I might be able to get a very nice useful overclock on a Q9650 and keep this LGA 775 kickin ass a few more years thanks again!!
post #8 of 11
Thread Starter 
Hello everyone I have just one more question that I would like to ask here.

I recently played around in my bios a little more, seeing if I can try to performance overclock my CPU now for a bit before I get that new (used) Q9650.

I found out that I have been overclocking my CPU with a 2:3 FSB : DRAM setting. See CPU-Z Screenshot

So, after bumping my processor up to a minor 3.0 Ghz (from previous 2.95 OC, 2.53 is stock for E7200s), I noticed I'm also running memory speed of 474 MHz (with 400 stock)? Or is that CPU-Z value normally the 800 MHz they rate dual channel memory?

So my question is:
would it be better for me to drop my FSB : DRAM to a 1:1 (which I think would mean I go into bios and select either 2.000B or 2.000D for my memory multiplier?) and go for a higher overclock on this old dual core, or should I stay about where I'm at (I think I remember having stability issues going much past 3.0 earlier with these RAM settings, now I know why ) and enjoy the higher RAM speed? I don't know how much farther the CPU can go, nor how much the fast RAM speed is worth.

Sorry this got long/wordy, and thanks to any of those who reply and offer advice once again!
Edited by Monkeyclaw - 10/19/11 at 10:44am
post #9 of 11
Quote:
Originally Posted by Monkeyclaw View Post
Hello everyone I have just one more question that I would like to ask here.

I recently played around in my bios a little more, seeing if I can try to performance overclock my CPU now for a bit before I get that new (used) Q9650.

I found out that I have been overclocking my CPU with a 2:3 FSB : DRAM setting. See CPU-Z Screenshot

So, after bumping my processor up to a minor 3.0 Ghz (from previous 2.95 OC, 2.53 is stock for E7200s), I noticed I'm also running memory speed of 474 MHz (with 400 stock)? Or is that CPU-Z value normally the 800 MHz they rate dual channel memory?

So my question is:
would it be better for me to drop my FSB : DRAM to a 1:1 (which I think would mean I go into bios and select either 2.000B or 2.000D for my memory multiplier?) and go for a higher overclock on this old dual core, or should I stay about where I'm at (I think I remember having stability issues going much past 3.0 earlier with these RAM settings, now I know why ) and enjoy the higher RAM speed? I don't know how much farther the CPU can go, nor how much the fast RAM speed is worth.

Sorry this got long/wordy, and thanks to any of those who reply and offer advice once again!
I would drop the RAM to 1:1 and as long as your temps/Vcore are good go for a faster OC.

NB. you can always try raising the RAM "AFTER" you have a nice maxed out OC on the CPU.


Z-CPU memmory speed is for one stick of ram, "DDR2" is dual channel ie a pair : so your effective DDR2 speed is 2 x 474 = 948mHz (normally you would see 400Mhz there, so 2 x 400 = 800)
Edited by aramil - 10/22/11 at 4:31am
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post #10 of 11
Thread Starter 
Ah okay, cool so that's pretty nice that my memory can get 475 MHz and run stable all this time. I actually just won a Q9650 recently at a good price, so I might just wait until I get that to dive back into overclocking. It's already lapped too (and passed a prime95 run etc after the fact), so that should be nice!

Definitely going to drop the RAM to 1:1 for the new processor, now I just have to see if a 2.000B or 2.000D memory multiplier is better for it. I heard something like the 2.000B keeps the memory timings tighter or something? We'll have to see.

Thanks for all your help!
Edited by Monkeyclaw - 10/23/11 at 9:44am
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