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CL 8 v. CL 9

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July 27, 2011 5:07:03 AM

Hello,
I have 6GB (3x2GB) of OCZ DDR3 1600 CL 8 8-8-8-24 at 1.65V. want to double it but it is no longer available. Newegg has Corsair DDR3 1600 but it is CL 9, timing is 9-9-9-24 but also 1.65V.

If this is compatible, which CL should I set and Where?

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July 27, 2011 8:31:18 AM

I wouldn't recommend using both. More than likely get instability and random bsod.
You should just stick to one set. Just wait for the sales to roll around and hopefully even cheaper ram and just buy a new set for 12gb or more.
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a b V Motherboard
July 27, 2011 9:57:21 AM

You would have to run 9-9-9-24 - the slower speed, because the faster RAM can run at the slower speed, but not the other way around.

However, I think that LGA1366 / X58 runs faster with a single bank of RAM than with two banks. Brutetal's advice sounds good - get a kit of 3 x 4GB DIMMs and then you don't have to worry about mixing specs.
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a b Ĉ ASUS
a b V Motherboard
July 27, 2011 2:14:43 PM

The Corsair you ref is $54
Newegg also Has the 8,8,8,24 DDR3-1600 for $76
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
As above posters indicated - (1) mixing two diff set sets of ram (CL rating) can be probmatic and yes you would need to set timings to the Lowest common denominator. You would reduce the risk of running into a problem using the corsair DDR3-1600 CL 8 @ 1.65 V - Note the word Lower risk. As some motherboards require some tweeks to get 6 modules runing stable.

If it was me, I'd opt for CompulsiveBuilder suggestion of bitting the bullet and go with 3 x 4:

3 x 4 (12 gigs DDR3-1600 CL9) Ripjaws $100
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
or @ $80, 3 x 4 DDR3-1333, CL9, @ 1.5 V
http://www.newegg.com/Product/Product.aspx?Item=N82E168...


Bottom line from a couple of reviews on Memory.
here is NO performance difference between the Between CL 8 and CL9 outside benchmarks. Going from DDR 1333 CL9 to DDR3-1600 CL9 - The performance increase is very Slight, and in most cases the average user will not notice any performance differnce.

That in Mind, rhe DDR3-1600, CL9 is considered to be the "Sweet spot" for the new Sandybridge (SB) Systems. Only go with the Lower CL if price is within Approx $10. Also the intel Spec sheet for the SB CPUs states a Max ram voltage of 1.575 V (I use 1.60 V Ram and many others moved their 1.65 V over). I only mention this in the event that you Upgrade you system (Not a recommendation); However For one reason or anther you might Upgrade to take advantage of newer MB features - Then again it could be a "forced" upgrade, ie MB fails. The two 3 x 4 Ram would work very well in new system.
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a c 207 Ĉ ASUS
a c 717 V Motherboard
July 27, 2011 2:39:01 PM

I agree with a combination of the above answers: @brutetal "likely get instability" and @CompulsiveBuilder "get a kit of 3 x 4GB DIMM" and @RetiredChief "F3-12800CL9T-12GBRL" for a cheap 3x4GB NEW set.

The OCZ isn't around any longer because they built horrible RAM; particularly the Gold & Platinum lines. Yes, you could Manually set the CAS Timings and use the 'worst' values of each set, but the IC's themselves are different and chances are you'll probably end up running two DDR3 1600 at DDR3 1333 frequency.

Kits I would consider -> http://www.newegg.com/Product/Productcompare.aspx?Submi...|20-233-146^20-233-146-TS%2C20-145-321^20-145-321-TS%2C20-226-192^20-226-192-TS%2C20-226-194^20-226-194-TS%2C20-226-202^20-226-202-TS

My picks:
$105 For 'Cheap & Good' - 1600 9-9-9-24-2N @ 1.50v Mushkin Enhanced Blackline 12GB (3 x 4GB) SDRAM DDR3 1600 Model 998995

$170 For 'OC' - 1600 7-8-7-24-2N @ 1.65v Mushkin Enhanced Redline 12GB (3 x 4GB) SDRAM DDR3 1600 Model 998999

Using a BCLK >180 and your i7 920 @ 4.0GHz or faster
$259 For 'Extreme OC' - 2000 9-11-9-27-2N @ 1.65v CORSAIR DOMINATOR GT 12GB (3 x 4GB) SDRAM DDR3 2000 with Air Fan Model CMT12GX3M3A2000C9

IMO the Mushkin Blackline 998995 is very good.
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July 27, 2011 7:15:55 PM

Thanks for the quick and simple-to -understand answers, all. I'm leaning toward the 3x4 solution. The Mushkin Enhanced sounds good for my wallet and expertise level. I'm chicken to overclock. My i7 -920 2.66GHz on an ASUS P6T Deluxe V2 mobo is doing me fine as-is except for often fatal lag in Black Ops (probably my ISP). Corsair does have a devil-may-care ring to it.
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a c 207 Ĉ ASUS
a c 717 V Motherboard
July 27, 2011 7:39:18 PM

I've used both Mushkin & Corsair Dominator both are good choices. IMO - again Mushkin Blackline 998995. The Corsair Dominator CMP12GX3M3A1600C9 are great but don't warrant the +$50 over the Mushkin Blackline 998995.

The DDR3 1600 CAS 8-9-8-24-2N @ 1.60v Mushkin Enhanced Blackline 12GB (3 x 4GB) Model 998989 might be worth the +$30 -> http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Unless I'm looking at tight CAS 8-8-8 the difference 8-9-8 is negligible whereas CAS 7-8-7 does offer FPS improvements but not for $65 for 'most' folks.

...Just putting it all out there ;) 
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July 27, 2011 8:07:25 PM

Again, excellent and clear answers. Now I'm dithering (which is why it took me 3 months to decide on my build components...lol). To close this thread out, do I have to choose "Best Answer" or what?
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a c 207 Ĉ ASUS
a c 717 V Motherboard
July 27, 2011 8:44:30 PM

To close yes choose best answer; give it to @RetiredChief

Good Luck! :) 
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July 27, 2011 9:38:27 PM

Best answer selected by grandpa.
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