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Which memory should I upgrade to from my old DDR2 400MHz?

Last response: in Overclocking
October 31, 2011 1:15:19 PM

Hey everyone,

I'm about to make my 1st OC attempt and it'll be on a E8400 3.0GHz Wolfdale. However, I noticed (yeah I'm a noob!) that my memory kinda sucks atm: 2 X 2GIG DDR2 400MHz Kingston. (5:6, FSB: DRAM)

I'll be replacing that memory with another 4GIG and it has to be from the list found here: as I don't want to wait for 5-7 business days that comes with Newegg shipping and the such.

My question is: which one should I get?

To help, I can say that my motherboard is a
ASUS P5K/EPU, Chipset: Intel P35/G33/G31 and the version of the Graphic Interface is PCI-Express with a Link Width of x16 and Max. Supported x16.

October 31, 2011 1:38:43 PM

Are you sure the ram is 400 and not 800. Most programs like cpu z display the single data rate speed.

if you want to go with a 2x2 or 4x2 kit go with the cheapest 1066 ram you can find. Even if your board does not use 1066 native you can use the over clock bios options to get the ram up pretty high.

I am running a q9650 3.0 oced to 3.6 with the 800ddr ram oced to 960. With an Asus P5N-D. I am using a cheap g-skill 4x2gig kit.
October 31, 2011 2:20:43 PM

On a note your motherboard does not support DDR3 which you linked to on your post, you need to use DDR2 for that motherboard. And as the last poster posted the fastest memory for your board would be DDR2 1066. Although one of the issues with your system is that DDR2 is not cheap the cheapest 1066 4GB kit is ~$87 and if this was DDR3 a 4GB DDR3 1600Mhz kit is around ~$40 you can get 8GB for around $67 in DDR3 so I'm not sure if such an upgrade would be worth it for such a small speed increase. It may be more lucrative to just overclock what you have atm.
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a b K Overclocking
November 1, 2011 1:02:08 PM

I'm sure you have faster ram than ddr2 400mhz. Your system at stock will use 333 fsb, that will require 667mhz ram to run stock speed. Download cpu-z, run it, and under spd tab what do the top of the columns say?
November 1, 2011 2:48:19 PM

Cygnus x-1 said:
I'm sure you have faster ram than ddr2 400mhz. Your system at stock will use 333 fsb, that will require 667mhz ram to run stock speed. Download cpu-z, run it, and under spd tab what do the top of the columns say?

Here it is:

Slot 3 is the same as the Slot 1.

I have the feeling my memory is really 400MHz. Yes/No?
a b K Overclocking
November 1, 2011 3:16:13 PM

pc2-6400 is 800mhz ram. Like I said earlier, you would need 667mhz ram to run your computer stock, never mind overclocked.
November 1, 2011 3:32:54 PM

Aye, I'm going to the store tomorrow to buy some RAM. Out of the list I gave on the first post of this thread, which one do you recommend I get?

Also when I read that my RAM is (400MHz), I need to understand that in fact it's 800MHz?
a b K Overclocking
November 1, 2011 5:36:51 PM

I don't believe you mobo supports ddr3, you show all ddr3 in that list.

CPU-Z will usually report your ram as half because DDR=double data rate. A little comfusing, but that's the way they do it. What does cpu-z say under the memory tab?
November 1, 2011 6:57:17 PM

Don't buy any memory from that lisy because you can't use it, furthermore, you shouldn't buy any ram at all because it would be a waste of money. what you have now is perfectly fine for what you want to do and you would gain absolutely no perceivable performance gain buy buying different ram. For ddr2 their is only one tier above the ram you already have and it wouldn't be a significant boost.
a b } Memory
a b K Overclocking
November 1, 2011 8:57:50 PM

Agree with that up there^ you don't need memory. Your memory is plenty fast enough to work on your platform, you are tossing money down the drain. Yes, your RAM is running at 400mhz, but its DDR.....Double Data Rate, which means technically that the memory can be read from and written to at the same time, effectively "doubling" the band width it performs at, or 800mhz. That is how DDR speed works.
For instance 1066mhz RAM actually runs at 533mhz.
However, remember RAM is not sold at the speed is runs, it is sold at the speed it is guaranteed to work. The motherboard and processor combination is what determines the default speed memory will run at. You can overclock your processor just fine, just up the RAM divider and slow your memory down a little if you have problems, as you raise the bus speed, your memory will come back into line with the specs it should be running.
November 2, 2011 1:08:49 AM

I knew it was 800.
As every one said keep your current ram and over clock it a bit. I can push my 800mhz kit to over 1000 if i want. The performance increase between 800 and 1066 is pretty low.
November 2, 2011 1:37:07 AM

Well you guys make a strong case. Saving that 75$ is good news to me.

Should I grab a cheap fan (I see plenty CPU fans around 15-20$) if I want to OC from 3.00 GHz to let's say 4.00 GHz?
November 2, 2011 1:59:15 PM

4.0 is a bold move you will most liketly need a high end $50+ cooler to get that high but if your careful it can't hurt to try. I would be supprised if a $15 cooler is better than the stock one.

Start at 3.4 and watch your temps. If they are good try for 3.6. Run it at 3.6 for a few days and use core temp to log temps all the time. If they are good then Try for 3.8 or 4.0. Anything over 3.6 will most likely take a bit of voltage and NB tweaking.

Once you got your cpu where you want it start on the ram.

On my q9650 I settled for 3.6 because it is stable with speedstep on, thermal managment on, and no voltage or North bridge adjustments. To get to 3.66 or 3.7 I had to crank the vcore a bit.
November 3, 2011 2:15:58 PM

I bought the Cooler Master Hyper N520. Hopefully this will allow me to go to 4.0 GHz temperature-wise.