What's the best memory RAM for my computer?

[rabujento]

Hi all, Iam Mário from Brazil.

I just bought a new computer, but i'd like to put the fastest memory, i dont mind with price.

So i wonder whats the best nowdays? i was thinking in put corsair dominator 1066 Mhz but i heard that my motherboard doesnot support 8gb ram at this clock.

So, please help me.


Motherboard > asus >>m3a78
Processor > AMD phenom II 940 3.0Mhz

 

[Scotteq]

I do not believe Phenoms support speeds greater than 800Mhz at the quantity you are looking to use. Please check with your motherboard maker as to what they do support.

 

[badge]

Motherboard > asus >>m3a78
Processor > AMD phenom II 940 3.0Mhz

Incredibally, I have this exact setup with 8GBs PC2 8500 at 1066MHz. 940 is at 3.6GHz.

http://www.newegg.com/Product/Product.aspx?Item=N82E16813131324

 

[rabujento]

hmmm but badge, your motherboard is m3a78-em, mine is just m3a78.

i think theres a diference well i dunno.

i heard that my motherboard wont be able to use 8gb ddr 2 at 1066.

but well iam ok with this, i know that there are very good ddr2 800 high performance.

so which one shuld i buy?

 

[badge]

If it helps any, two of these 2 x 2GB kits work perfectly at 1066MHz. with that MB.

http://www.newegg.com/Product/Product.aspx?Item=N82E16820231166

 

[badge]

Product page.

http://www.asus.com/product.aspx?P_ID=5pvgDAXJUV2orYzn&templete=2

 

[rabujento]

your saying that i could put 8gb of this memory on my model of motherboard and this would work at 1066?

 

[rabujento]

i dont undestand this

"Due to AMD CPU limitation, DDR2 1066 is supported by AM2+ CPU for one DIMM per channel only. Please refer to www.asus.com or user manual for Memory QVL."

 

[badge]

So, the 770 chipset will not support more than 2 DIMMs at 1066MHz. My board has the 780 which supports 8 gigs at 1066MHz. just fine.

 

[badge]

Your MB will support 8 GBs of RAM no matter if you install PC2 8500 or PC2 6400. But the chipset will not attain PC2 8500 1066MHz. speeds. Bottom line, you can use 8 GBs DDR2, but the top speed is limited when doing so. PC2 8500 is simply overclockable PC2 6400 800Mhz. RAM.

 

[badge]

your saying that i could put 8gb of this memory on my model of motherboard and this would work at 1066?

Your MB will support 8 GBs of RAM no matter if you install PC2 8500 or PC2 6400. But the chipset will not attain PC2 8500 1066MHz. speeds. Bottom line, you can use 8 GBs DDR2, but the top speed is limited when doing so. PC2 8500 is simply overclockable PC2 6400 800Mhz. RAM.

 

[rabujento]

thanks mate. so do you think is worth to buy the best ddr2 800 and then make a overclock ?

 

[badge]

i dont undestand this

"Due to AMD CPU limitation, DDR2 1066 is supported by AM2+ CPU for one DIMM per channel only. Please refer to www.asus.com or user manual for Memory QVL."

If all four DIMM slots are populated (8 GBs uses all four) PC2 8500 1066MHz. is not an attainable speed or data transfer rate. But, all four DIMM slots can be populated (the MB will support 8 GBs) at a lower data transfer rate than 1066MHz., say 800 MHz. for example. It does not mean that PC2 8500 rated DIMMs will not work on the MB. They will work, and 8 GBs worth, but not at their rated speed of 1066MHz.

 

[badge]

thanks mate. so do you think is worth to buy the best ddr2 800 and then make a overclock ?

Haha! Yeah just buy 8 GBs PC2 6400 800MHz. for that board. BIOS will have a setting for 800MHz. Should work without issue in that configuration. The PII 940 has an unlocked multiplier, which I use to overclock. I then set my RAM speed to 1066MHz. in BIOS, 8 GBs at 1066MHz. with the processor at 3.6GHz. via the unlocked multiplier. Your board will not run at 1066MHz. like this with 8GBs. But 8 gigs will run at something less than 1066MHz.

 

[rabujento]

badge, what ddr2 800 you recommend for me?

 

[badge]

I had 8 GBs of this PC26400 running fine in my board. But, even by OCing the system BUS these kits would not reach 1066MHz. They would run at around 900MHz. or slightly less with the board which is pretty well for price/performance.

http://www.newegg.com/Product/Product.aspx?Item=N82E16820231122

 

[badge]

BTW, if that MB is running, be sure to update to the latest BIOS version which will support the PII 940.

 

[rabujento]

bios is up to the date.


what do you think about this one http://www.newegg.com/Product/Product.aspx?Item=N82E16820145184

 

[cjl]

This stuff's pretty nice:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231194

Even if you can't get it to run at 1066, it'll probably run 800MHz with CAS 4 or lower without much extra voltage. Besides, I would be surprised if you couldn't get 1066MHz working with 8 gigs. My motherboard claims support for only one DDR3-1600 DIMM per channel, but I'm running 12 gigs (2 per channel) at that speed with tighter than rated timings without difficulty.

Otherwise, this is also good stuff:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231209

 

[rabujento]

iam about to buy those corsair i showed above. do you think they are good for overclocking?

 

[cjl]

Not bad, but not as good as the G.Skill that I linked to.

 

[rabujento]

hmmm cool but i think ill buy the corsair 1066 dominator anyway, ill try to make the 8gb run at 1066 and even if they dont, ill w8 for any update in bios or something, and then if they update bios..ill be already ready to use the 1066 what do you think?

 

[cjl]

That should work. Dominator is good memory.

 

[badge]

If Ocing by the unlocked multiplier, the RAM does not move to higher clocks because the system BUS is not OC'ed, the CPU multiplier is. Anyway, if OCing by increasing the BUS speed, the G. Skill PC26400 RAM I linked will run at near 900MHz. @ 4-4-4-12. That's why everyone on the 'egg gives it such a high rating.

 

[rabujento]

iam going for those corsair dominator.. allowed? ehehe