Are my calculations correct??? I really don't know anymore:(

[Laymen]

I am gonna recommend a Core 2 Duo processor to my friend, more specifically an E6400 and I am still a newbie when it comes to Conroe, so was wondering if my below assumptions are correct,

Lets say I would want to overclock that E6400 from its default 2.13Ghz to 2.7Ghz. Would that be possible with the components I chose?

Asus P5B Deluxe P965 (ATX, PCI-e, Sound, LAN, SATA II, RAID
512MB x 2 (1GB) PC8500 DDR2, CL5 (Kingston, KHX8500D2K2/1G)

I suppose the multiplier on the 2.13Ghz version is 8?? As in 266*8= 2130Mhz, so if I want the chip to run at 2700Mhz I would have to increase the FSB to 337? Is that even possible with that Asus board, I read it has plenty of overclocking options but I never found any bios screens for it I also read that the P5B deluxe has problems with any FSB between 300 and 400 or is that already fixed in a newer bios? Aaaarg, I am so used to AMD overclocking but isn't intel overclocking exactly the same?

So on with my calculations, if I put the FSB on that 2.13Ghz chip on 337 then my memory would be running at DDR675(1350Mhz). And if I took that Kingston memory then this would certainly be too much right, cuz its only specced to 1066Mhz. So then I would have to put it on a divider right to get close to that 1066, but which one?? Is there some kind of tool to calculate this, I know AMD had a tool called A64MemFreq11.exe but for the new Intels I found no such tool

How do I calculate all this stuff for Core 2 duo motherboards??

Thnx mucho


EDIT : Was looking around on other forum and this guy calculated conroe dividers as follows,

Using this you can figure out which settings will work well for you, but all this takes into account the you will not overclock your memory, because if you did you could probably manange more than DDR2-800.

some more, if you chose DDR800 in the BIOS - 266/2*3=399, so the divider for DDR800 is 2/3 but choose DDR800 with a fsb of 300 and you'll go way over spec (300/2*3=450).

So going by his figures, suppose my FSB is set to my likened 337, my calculation would be as follows,

337/2 * 3 = 505.5 --->>> 1011Mhz so fully within specs of that Kingston, would then only lose like 50Mhz??

Is that calculation correct? So suppose I still have some headway and I overclock my FSB a little more to get closer to my 1066Mhz target I'd take for example,

355/2 * 3 = 532.5 --->>> 1065Mhz fully within spec with 2/3 divider and CPU running at 2840Mhz

Tell me plz if I am correct in my calculations so I don't end up with any nasty surprises if I start overclocking my mates comp:LOL:

 

[smopoim86]

http://www.anandtech.com/mb/showdoc.aspx?i=2822

Great choice on that board, the new bios may unlock the multiplier.
your calculations look good and that board should hit 400mhz on the fsb without issues

 

[NoStateofMind]

Ummm don't count me as right yet but running your FSB at 400Mhz would make your RAM at 800Mhz, not 1200. Your FSB (Subsystem) Would effectively run at 1200Mhz, your RAM subsystem at 800Mhz, and your CPU at 8*400Mhz = 3.2Ghz. So I would resommend DDR2-800. That's all you need.

Note: I'm a noob at this stuff too, so wait for someone to back me up on this.

 

[Lonyo]

If you aim for ~400MHz clock (3200MHz 8*400) and get some DDR2-800 you should be fine.

DDR2-800 is about all you need really (http://www.anandtech.com/memory/showdoc.aspx?i=2800&p=7) since there are marginal gains above that speed, and 3200MHz is a reasonable overclock (since you don't appear to be going all out), then you can run 1:1.
Obviously faster RAM would be nice, but it's not necessary, and 800 also means you can stick it on a 1:1 mem divider and avoid any unexpected things.

Clock = 1
RAM = 2 (using 1:1 divider)
FSB = 4 in relative terms.

So 400MHz clock would give you 800MHz DDR2 and a 1600MHz FSB.

 

[NoStateofMind]

Originally posted by: Lonyo
If you aim for ~400MHz clock (3200MHz 8*400) and get some DDR2-800 you should be fine.

DDR2-800 is about all you need really (http://www.anandtech.com/memory/showdoc.aspx?i=2800&p=7) since there are marginal gains above that speed, and 3200MHz is a reasonable overclock (since you don't appear to be going all out), then you can run 1:1.
Obviously faster RAM would be nice, but it's not necessary, and 800 also means you can stick it on a 1:1 mem divider and avoid any unexpected things.

Clock = 1
RAM = 2 (using 1:1 divider)
FSB = 4 in relative terms.

So 400MHz clock would give you 800MHz DDR2 and a 1600MHz FSB.

Dammit I was think quad pumped for FSB, but nooooooo gotta have a brain fart!

 

[cmdrdredd]

You an play it safe and with the new BIOS drop the Multi to 7, FSB to 400Mhz, memory at DDR2-800 and run 2.8Ghz on the CPU. That's what I'm doing with that exact ZCPU and motherboard. 3.2Ghz required a bit more voltage and my HSF which is a Zalman CNPS9500 still isn't the best.

 

[zizo]

400FSB is no problem for P5B deluxe. Mine goes up to 490 with all voltages on auto.
pic

 

[Laymen]

Thnx to everyone for your responses, it certainly clears up alot of dark areas I had And the winner of best forum goes to anandtech, had posted this same question since yesterday on 5 diff sites and here I get several replies in just one day instead of 0 on 4 of the other sites and just 1 reply on the remaining site:LOL:

Cheerz to ya all,

Laymen

 

[n7]

Originally posted by: zizo
400FSB is no problem for P5B deluxe. Mine goes up to 490 with all voltages on auto.
pic

I can't get up to 490 till i get my good RAM, but here are my results with crappy RAM.

Yes, you can OC with the P5B Deluxe like a mofo

 

[harpoon84]

Originally posted by: PC Surgeon
Ummm don't count me as right yet but running your FSB at 400Mhz would make your RAM at 800Mhz, not 1200. Your FSB (Subsystem) Would effectively run at 1200Mhz, your RAM subsystem at 800Mhz, and your CPU at 8*400Mhz = 3.2Ghz. So I would resommend DDR2-800. That's all you need.

Note: I'm a noob at this stuff too, so wait for someone to back me up on this.

You got the RAM speed right bu not the FSB. FSB is quad pumped, so 4x400 = 1600MHz effective FSB.

 

[NoStateofMind]

Originally posted by: harpoon84

Originally posted by: PC Surgeon
Ummm don't count me as right yet but running your FSB at 400Mhz would make your RAM at 800Mhz, not 1200. Your FSB (Subsystem) Would effectively run at 1200Mhz, your RAM subsystem at 800Mhz, and your CPU at 8*400Mhz = 3.2Ghz. So I would resommend DDR2-800. That's all you need.

Note: I'm a noob at this stuff too, so wait for someone to back me up on this.

You got the RAM speed right bu not the FSB. FSB is quad pumped, so 4x400 = 1600MHz effective FSB.

Yeah I got it on my next post....rub it in why dont ya!!

 

[zizo]

Originally posted by: n7

Originally posted by: zizo
400FSB is no problem for P5B deluxe. Mine goes up to 490 with all voltages on auto.
pic

I can't get up to 490 till i get my good RAM, but here are my results with crappy RAM.

Yes, you can OC with the P5B Deluxe like a mofo

lol that's right! BTW what kind of temps do you get with 1.4v? Mine are so flowered up. Asus probe II shows 50c idle and 70c dual prime but I guess it should be under 50c full load.

 

[cmdrdredd]

Originally posted by: zizo

Originally posted by: n7

Originally posted by: zizo
400FSB is no problem for P5B deluxe. Mine goes up to 490 with all voltages on auto.
pic

I can't get up to 490 till i get my good RAM, but here are my results with crappy RAM.

Yes, you can OC with the P5B Deluxe like a mofo

lol that's right! BTW what kind of temps do you get with 1.4v? Mine are so flowered up. Asus probe II shows 50c idle and 70c dual prime but I guess it should be under 50c full load.

I think all the temps from the P5B are wrong. There's no possible way you won't get an error/crash/throttle issue when you have such a hot CPU. Especially when my exact setup with a different motherboard using a higher vcore and overclock than I use gets lower temps. I also lapped my IHS on my C2D to get direct copper ro copper contact. That's not possible really. It's just beyond my understanding how the readings can show 70c at load and still run 100% stable for 24hours of dual prime when Intel says it's not safe above 61c. Something would crash or give an error or would just break. Seriously.

 

[Laymen]

The temps from the P5B are indeed wrong, I don't own the board yet and my mate is still in process of ordering stuff, but I read on XSforums that a program called CORETEMP reads temperatures more realistically. That or buy some aerogate fancontroller and slap those temperatureprobes under the CPU to see what kind of temp you'r really getting.

On another note, I have decided to ditch the PC8500 and am going for this memory now,

http://www.corsairmemory.com/corsair/products/specs/CM2X1024-6400PRO.pdf

Hope thats some good memory with good overclockpotential and stability should I need it

 

[NoStateofMind]

Originally posted by: Laymen
The temps from the P5B are indeed wrong, I don't own the board yet and my mate is still in process of ordering stuff, but I read on XSforums that a program called CORETEMP reads temperatures more realistically. That or buy some aerogate fancontroller and slap those temperatureprobes under the CPU to see what kind of temp you'r really getting.

On another note, I have decided to ditch the PC8500 and am going for this memory now,

http://www.corsairmemory.com/corsair/products/specs/CM2X1024-6400PRO.pdf

Hope thats some good memory with good overclockpotential and stability should I need it

If you have been over to XSForums then you should know about Team Group RAM....Best there is IMO. Is my opinion based on experience, no, so take what I say with a grain of salt. But all you have to do or see is the low timings with low voltages and good overclocking to see they are the best.

 

[Laymen]

Yeah could well be true, but I will go for second best then cuz I can't find their ram anywhere in Belgium or Holland, so will have to go for corsair anyways.