Solved Underclock my DDR2-800 to 'match' my Q8400 FSB?

October 5, 2013 at 08:23:21
Specs: Wind 7 home premium 64-bit, q8400 c2q@2.66
i have DDR2-800 RAM with a q8400 Core2Quad with 333mhz FSB...
somewhere along the way i was told that i should OC my CPU or underclock my RAM so the frequencies matched up. while it certainly has an air of logic, it seems to me as though my PC has lost a step with my RAM under-clocked to be "DDR2-667" instead of the DDR2-800 that it is...
anybody with experience and/or knowledge to share would be greatly appreciated...
for informational purposes - i never had any problems whatsoever with my RAM @400 and my
CPU @333, and i would hate to think i was making my unit a bit slower for no good reason, especially since the N/S bridges and CPU/RAM is becoming a bit "last-gen" at this point, if you know what i mean!
thanks for any help or info!

~The GrimReefer


See More: Underclock my DDR2-800 to match my Q8400 FSB?

Report •

#1
October 5, 2013 at 09:21:09
✔ Best Answer
Theoretically, your CPU & RAM should be configured to run their frequencies at either 1:1 or 1:2 ratio. The Q8400's default frequency is 333MHz (aka 1333MHz FSB), so the RAM should be run at either 333MHz (DDR667) or 667MHz (DDR1333). It certainly won't hurt anything to run your RAM at 400MHz (DDR800) but it's not the optimal configuration. If it were my system, I would increase the CPU frequency to 400MHz to match the RAM rather than lowering the RAM frequency to match the CPU.

Report •

#2
October 5, 2013 at 10:30:00
yes, of course... thats what i tried first, but my current cooling solution isnt/wasnt up to the task of handling the increased heat from o/c my CPU to 400...
thats why i u/c my RAM to 667... that being said, is it really faster or better for my PC to run the RAM slower than it is built for? like i said above - it has some logic, matching the fsb and ram freq... i just HATE slowing anything down! but until i can afford a decent heatsink&fan for my 775, if i need to match, its my only choice!
thanks for the feedback!

Report •

#3
October 5, 2013 at 19:11:36
"my current cooling solution isnt/wasnt up to the task of handling the increased heat from o/c my CPU to 400..."

How much do you know about overclocking? When you bumped up the CPU frequency to 400MHz, did you keep the multiplier at it's default (8x) or did you lower it to 7x? Was the system unstable at 400MHz? What was the CPU temp? Did it come close to 72C?

http://ark.intel.com/products/38512

message edited by riider


Report •

Related Solutions

#4
October 6, 2013 at 04:51:49
Agreed, you do not need to go with 400x8=3.2GHz but you can go with 400x7=2.8GHz which is a much milder OC, should not effect the temperature very much, and has the definite advantage of the faster FSB, though with decent case cooling, the higher OC should be reachable. Note further that some motherboards allow 1/2 multipliers so 7.5 might also be an option.

You have to be a little bit crazy to keep you from going insane.


Report •

#5
October 7, 2013 at 11:58:07
i dont know "tons" - for the most part, i am not an overclocker... however, i changed the multiplier so it was 7x400=2.8ghz, and the temps were well OVER 72 - topping out in the low 90s[c], which i concluded to be WAY too hot to be worth it! i didnt have much time to check stability, since i was monitoring the temps real time, and therefore turned the machine off once the temps started to go so high! id like to get a decent cooler so i can O/C to 7x400 to get that last bit out this machine, as i will be upgrading the cpu/ram/mb come "tax time"... ive never had any stability problems besides the heat issues with the overclock attempt...


Report •

#6
October 7, 2013 at 15:30:56
You were right to terminate the test considering the temperature. That said, it does seem too high and you may be running too hot all of the time. Please post your current temps at stock settings and what the VCore is reading in your BIOS. You either have a heat sink with improperly applied thermal compound or a CPU voltage setting too high.
I am running a couple of Core 2 Duo's OC at 3.2GB and above and they idle in the mid 30C's and never go over about 56C at any time on stock Intel heat sinks (one is installed with the Intel thermal material that was factory applied and the other is an aftermarket compound). I know that the Quad's do run a bit hotter, but that is way to high for that mild an OC.

You have to be a little bit crazy to keep you from going insane.


Report •

#7
October 8, 2013 at 13:25:23
well, yeah - the thermal stresses between duos and quads is large! i think im a 95w!? duos are like 45 or 65 arent they? that being said, i could probably reset with some better thermal grease, this much is true... the info youve requested is below. thanks again for the feedback!
1.128-1.232 voltage core[cpu-z]
i bought the cpu OEM, so it didnt come with the "stock" intel cooler... in retrospect i wouldve bought one, but the first one i found with a copper core and "made for core 2 quads" was a little thermaltake TR-2...
idle @~50; load @~70 [max@72 on RealTemp]

Report •

#8
October 8, 2013 at 16:23:08
The VCore sounds about right, slightly higher than my E8200 OC as long as it is on Auto voltage (though you can try fixing it to 1.128 and see if that is better and stable).
Did the heat sink come with thermal compound, thermal pad, or preapplied material? Please see this page and find your processor to see the best method of cleaning and reapplying compound and maybe try that (make sure that you remove all old compound and do not touch the surface after cleaning):
http://www.arcticsilver.com/intel_a...
Your CPU details:
http://www.cpu-world.com/CPUs/Core_...
Also, if the fan on the heat sink is not a good one, and it is replaceable, you may be able to purchase a decent one for $5.-$10. and improve your air flow across the heat sink. Note, that I assumed that you have cleaned out the dust from the heat sink, so if you have not recently, pick up a can of compressed air and blow it out as well.

You have to be a little bit crazy to keep you from going insane.

message edited by Fingers


Report •

#9
October 9, 2013 at 07:48:16
correct: dust build-up is not an issue... i try to clean my PC every 6 weeks or so to avoid such things...
the fan [if i remember correctly] came with a pre-applied thermal pad, which i am normally not a fan of, but in this case went with it... i am going to get some new thermal compound [presently] to try and get some better cooling, allowing me to go 7x400 on the FSB/CPU, and turn my DDR back to 800 where it wants to be...
i really need every little bit of throughput to the GPU that i can get - basically just trying to pass the time until February when i can upgrade! that being said, whats everyones opinion on the best Thermal Compound? bang for the buck is important here - i am poor and disabled, so i have very little in the way of "extra" money...
i am hoping to find something good for ~$10 -- $15...
any info would be greatly appreciated, and thanks again for 'everyones' time and responses!

GO SEAHAWKS!!!


Report •

#10
October 9, 2013 at 19:57:00
You do not need to spend a lot of money on thermal compound.
As you can see on the link below, there are some highly rated ones under $5. so you do not need to spend over $10. for sure to get something good (targeting the $3. to $8. ones should be more than enough). I even chose only those that included free shipping if you chose to order rather than visit a local store.
http://www.newegg.com/Product/Produ...

You have to be a little bit crazy to keep you from going insane.


Report •

#11
October 10, 2013 at 10:28:13
thanks! thats actually really funny, as that was the exact item i was looking at while visiting newegg this morning! ultimately, i figured it was either the white arctic fox, or the black!
now what i really need some good feedback on is what CPU Fan&Heatsink to get for my Intel Socket 775 Core2Quad [95w]!
unless my thermal compound is the worst ive ever seen, idk why this Thermaltake TR-2 wouldnt work better! its supposed to be designed with my type of CPU in mind!@
so whats the best <$50 solution, if my current setup is not up to the task of over clocking the fsb to 400[x7]???
thanks again...

Report •

#12
October 10, 2013 at 20:50:03
First try the thermal compound, I suspect that may be enough.
If not look for this one or the many like it that are also highly regarded, just make sure that the one you choose will fit in your set up. If needed, there are smaller and lower profile ones as well.
http://www.newegg.com/Product/Produ...
And choose to orient it to blow towards your rear exhaust fan if at all possible to get rid of the heat.

You have to be a little bit crazy to keep you from going insane.


Report •

Ask Question