Upgrading RAM to 1066 mhz DDRII

April 28, 2009 at 03:45:07
Specs: Windows XP, E4600 C2D/ OCZ 2GB 800mhz DDRII
Hi, I currently use 2GB of 800mhz DDR2 (2 X
1GB dual channel). My question is that my
motherboard supports 1066mhz DDR2 ram but
I wanted it to know that can I put in 2 X 2GB
dualchannel of 1066mhz DDR2 ram for total of
4GB in that board and also how will I have to
overclock this to use 1066mhz because on the manufactures website says something about
Dual Channel DDR2 1066 by O.C.
Here is the link for my mobo
http://www.gigabyte.com.tw/Products...
Its a Gigabyte GA-P31-DS3L
My system spec are
VGA Brand : XFX Model : 8800 GT
CPU Brand : Intel Model : E4600 Speed: 2.80 GHZ
Operation System : Win XP 64-bit SP :
SP2
Memory Brand : OCZ Type : DDRII
Memory Size : 2GB Speed : 800 mhz
Power Supply : 500 W


Thanks


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#1
April 28, 2009 at 04:57:30
1. This is a hardware question, not a CPU/overclocking question.

2. The E4600 runs at 800MHz FSB (200MHz frequency). DDR2-800 is the correct RAM for a 1:2 ratio. If anything, you should be adjusting your settings to run the CPU at 1600MHz FSB (400MHz freq) to match the RAM at 1:1 ratio. Regardless, DDR2-1066 will not significantly improve performance, if at all.

3. If you pair up DDR2-800 with DDR2-1066, the DDR2-800 can NOT run at DDR2-1066 speed, so the DDR2-1066 will underclock to DDR2-800 speed.

4. Here's 4GB (2 x 2GB) DDR2-800 for $28 after rebate. Buy it & sell the 2GB you have for $20.

http://www.newegg.com/Product/Produ...


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#2
April 28, 2009 at 05:10:38
Well, what if I use just the DDR2-1066 will it still underclock?
Also the reason I posted on the over clocking section is
because on the manufactures website it says something
about Dual Channel DDR2 1066 by O.C., so i wanted to know
do I have to overclock these DDR2 1066 to run at 1066?
Thanks for the quick reply.

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#3
April 28, 2009 at 06:02:08
There are two CPU:DRAM frequency ratios that offer best performance for an Intel system...1:1 or 1:2. The word "frequency" is very important. Do NOT work with the bogus advertised ratings. An Intel 800MHz FSB CPU does NOT run at 800MHz, it runs at 200MHz frequency. And DDR2-800 does NOT run at 800MHz, it runs at 400MHz frequency.

Your CPU runs at 200MHz frequency by default. For 1:1 ratio, the RAM would need to run at 200MHz. That would mean underclocking the DDR2-800 to DDR2-400 speed. For 1:2 ratio, the DDR2-800 would need to run at 400MHz, which it already does by default.

DDR2-1066 runs at 533MHz...that doesn't fit either the 1:1 or 1:2 ratio criteria so peformance will be less than optimal unless you overclock the CPU. And the two choices in CPU frequency would be 266MHz (for 1:2) or 533MHz (for 1:1). It's doubtful that your board can handle 533MHz frequency (2133MHz FSB) but there are options in between.

The bottomline is that if you want to overclock your CPU, you do NOT need DDR2-1066 RAM, you'd just be wasting your money. Just keep the DDR2-800, jack up the CPU frequency to 400MHz (1600MHz FSB), lower the CPU multiplier to say, 8x, adjust the RAM settings so it stays in sync at 400MHz...this will run the CPU at 3.2GHz. If you're experienced at overclocking, you know that there are numerous other settings that will also need tweaking to be able to pull it off.


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#4
April 28, 2009 at 08:37:59
Oh, I see what you mean I'll try that and let you know how it
works out.
Thanks for clarification.

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#5
May 1, 2009 at 18:02:13
Ok so I tries what you said "Just keep the DDR2-800, jack
up the CPU frequency to 400MHz (1600MHz FSB), lower the
CPU multiplier to say, 8x, adjust the RAM settings so it stays
in sync at 400MHz." and got past the bios screen but I
couldn't boot into windows so, I did some research and found
that I have to set the PCI-E frequency to 118 MHz but I don't
really want to take that risk. So following is what I have
overclocked, PLEASE let me know if I have any better
options.

CPU multiplier = 10x
CPU freq = 300 --> 3.0 GHz
memory freq = 900 Mhz (O.C) --> so its 450

So I have 2:3 ratio

So please let me know if I have any better than what I have
set it to right now and also do I really have to have 1:2 or 1:1

Thanks


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