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AM2+ and DDR2, should I go with 4 GB of 1066 or 6 GB of 800?

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November 1, 2010 7:09:22 PM

I was reading around on the forums and I thought I read something about AM2+ mobos are not able to use 1066 DDR2 ram effectively. If that is the case, I have 2 GB of PC800 DDR2 RAM sitting around doing nothing. Would I be better off running 2x2GB sticks of 1066 DDR2 and 2x1GB sticks of 800 DDR2 all at 800 MHz?

If I'm really not careful, I can use up all 4 GBs of RAM, but with a little paying attention it's not hard to keep at least 1GB free at all times. 6 GB would be nicer, but I want to go for the best speed with one or two programs running over the best speed with 8 running.

More about : am2 ddr2 1066 800

November 1, 2010 8:17:03 PM

How would you get 6 gigs of ram? Is it one kit, or diffrent kinds. Also what Operating system are you using. Check to see if it is 32 or 64 bit. 32 bit systems cannot use anything over 4 gigs.
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a c 347 } Memory
November 1, 2010 8:19:04 PM

I guess define "effictivly" - if you mean will a jump from 800->1066 MHz yielding a 25% gain then NEVER. Ditto with 1333->1600 MHz yielding 17% gain. The gain may be anywhere from a lesser performance to a minimal gain 2-5%. It's ALL about the IC, CAS disparity, and somewhat about the speed; it's a complicated and surprising reality.

Look at the Speeds vs Benches in this example:

Overclock:
Comparison Module #1: Mushkin Redline 996805 6-8-6-24 1600MHz
Comparison Module #2: G.Skill Pi Series 7-8-7-24 1600MHz
Comparison Module #3: Mushkin 998687 8-9-8-24 1866MHz
Comparison Module #4: Corsair Dominator TR3X6G1600C8D 8-8-8-24 1600MHz
Comparison Module #5: Kingston HyperX T1 9-9-9-27 1600MHz
Comparison Module #6: Mushkin Blackline 998677B 7-7-7-20 1333MHz
Comparison Module #7: Patriot Viper II Sector 7 9-9-9-27 1800MHz


Stock:
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November 2, 2010 12:27:26 AM

I currently have a Gigabyte MA785GM-US2H AM2+ mobo with a Phenom II 955 black box processor and 4 GB of 1066 DDR ram and a Nvidia Geforce 9800 GT.


The other two sticks of DDR2 are 2x 1 GB PNY 800 MHz modules
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a c 347 } Memory
November 2, 2010 12:00:05 PM

You need to run them ALL at 800 MHz, Manually set the CAS to the SLOWEST {6 vs 7 -> 7 is slowest}, and 'try' to average the rated Voltage. However, mix-matched RAM is never a good idea and we see 5-10 posts per day with this same or similar issue.

Example:
1066 7-7-7-25 @ 1.6V
800 5-5-5-27 @ 1.5V
================
800 7-7-7-27 @ 1.55V

However, if it were 'me' I'd yank and eBay the 2X1GB PNY. 4GB should be fine unless you running Pro Image or Rendering.
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