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PC2-6400 vs PC2-8500 Performance

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Burner27

Supreme [H]ardness
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Oct 23, 2000
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I am using the following memory now in a 4 x 1GB combination in my machine:

http://www.mushkin.com/doc/products/memory_detail.asp?id=350

it's in this setup:

Gigabyte GA-P35-DQ6
Intel Core 2 Quad Q6600
4GB Mushkin XP EPP DDR2 PC2-6400
eVGA 8800GTX
LG GGC-H20L SATA HD-DVD/Blu-Ray Reader/DVD Burner
Samsung SH-S203B DVD Burner
WD RaptorX HDD
2 x 500GB Seagate HDD
750GB Seagate HDD
1TB Hitachi
SB X-Fi Fatality
Onboard 10/100/1000 NIC
PCP&C 850w SSI PSU
Gigabyte 3D Aurora 570 case

I am trying to get it to run @ 1066Mhz @ 2.0v @ 5-5-5-15 timings but am getting application crashes. I seem stable in windows but not in certain encoding applications. At 5-5-5-15 timings @ 1.8v @ DDR2-800 settings I am fine. Everything works perfectly. As a side note, I have the BIOS settings for the ram set to TURBO. Not sure if that would make me more stable by putting it back to STANDARD. Is this setting even needed anymore?

My questions are, am I not giving this ram enough voltage? Should I set the BIOS settings for the RAM back to STANDARD? Would I benefit moving up to DDR2-1066 memory? Should I use 2 x 2GB modules instead of 4 x 1GB? Will I actually see a performance difference (not synthetic but REAL WORLD) by running it at 1066Mhz?

Thanks
 
I'm not surprised that DDR2-800 memory isn't happy at 1066MHz; RAM doesn't tend to overclock very well. I'd personally just leave it where it's stable; you can run Memtest86+ on it for some more confidence that there aren't any problems.

I don't think you'd see a real-world increase by going to 1066MHz RAM; RAM speed actually has very little importance on Core 2 processors. The only good reason for getting faster RAM is if you want to overclock your CPU higher than your RAM will allow (for DDR2-800 on a Q6600, that's 800/2 = 400*9 = 3.6GHz).
 
If you don't tweak literally every single timing to it's honestly not worth messing with dividers and adding voltage to have the memory run faster. I did a test where I ran my memory at 4x2B configuration at 700MHz, and raising it to 840MHz on the next divider and adding +0.1V actually made my memory benchmarks slightly decrease in score. (I had 5-5-5-15... 45, and performance level set to 7 in both cases). Everything else was auto.

Just tweak it at 800MHz, and leave it at that. They'll run cooler, and last much longer.

The only good reason for getting faster RAM is if you want to overclock your CPU higher than your RAM will allow (for DDR2-800 on a Q6600, that's 800/2 = 400*9 = 3.6GHz).
Click to expand...
 
Higher bandwidth(FSB) over higher frequency, that is where performance is gained.
 
blade52x said:
If you don't tweak literally every single timing to it's honestly not worth messing with dividers and adding voltage to have the memory run faster. I did a test where I ran my memory at 4x2B configuration at 700MHz, and raising it to 840MHz on the next divider and adding +0.1V actually made my memory benchmarks slightly decrease in score. (I had 5-5-5-15... 45, and performance level set to 7 in both cases). Everything else was auto.

Just tweak it at 800MHz, and leave it at that. They'll run cooler, and last much longer.
Click to expand...



My ram is spec'd to run at 4-4-3-10 timings @ 2.0v @ DDR2-800 speed. Right now I have it running at 1.8v @ 5-5-5-15 timings @ DDR2-800. I also have the ram set to TURBO (the three choices are Normal, Turbo & Extreme). Not sure if this setting actually does anything. Opinions?
 
I suggest putting it on standard, and adding a bump more to the MCH Voltages. Those turbo settings usually mess things up unless you are not overclocking, since you have no control over what it is "Turbo-ing"

That Mushkin overclocks very well and should be plenty happy at 1066. I have seen people running it stable at 4-4-4-12 2.1v at 1066
 
I have this board with an X6800 and 2X1024 of Corsair 667 or 800

I am trying to find the article on Anandtech that talks about settings for the ram..Anyway by setting your timing to ex. 5.4.4.10..The latency really drops..Not 5.5.5.15..I changed my timings to what they said and my SuperPi really dropped.
I know t his is not really helping..I will get you a link.
 
I have 4 of the same Mushkin as the OP, mine DOES NOT like 1066 2.1v at 4-4-4-12 with FOUR sticks. Two is fine, four needed like 2.2v which I didn't like. It will do 1066 at 5-5-5-15 at 2.1v no issues but I prefer stock settings at 800 4-4-3-10 2v, it just works well.
 
thebeephaha said:
I have 4 of the same Mushkin as the OP, mine DOES NOT like 1066 2.1v at 4-4-4-12 with FOUR sticks. Two is fine, four needed like 2.2v which I didn't like. It will do 1066 at 5-5-5-15 at 2.1v no issues but I prefer stock settings at 800 4-4-3-10 2v, it just works well.
Click to expand...

You say that it works well at the stock settings..If you can check your latency.it should be lower, hence faster..try 1066 at 5-5-5-10 or 12, damn I can't find the charts to show what they can be set at.
 
Yeah, either way it should have no issues at 555 timings I just think the OP needs to add a bit more voltage maybe to The ram itself since he is trying 2.0, maybe 2.1 is needed and MCH may need a bump as well. I believe the 443-10 mushkins are D9 so you know they like some volts
Code: 
http://ramlist.ath.cx/ddr2/
 
Yep..I notice in your sig that you use the DS4..stable as hell. I using one right now..I just set it up with a e6850 @3.6 and some OCZ and don't even think about ;)
This is my music mochine
 
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