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Better XMP on a 15% overclock, timmings or speed?

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  • Memory
  • Overclocking
  • DDR3
  • Product
Last response: in Memory
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December 31, 2010 1:35:51 AM

I saw the Newegg deal a little bit ago and can't decide which of these two 12gb sets to get

DDR3-1600 7-9-7-21
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

or

DDR3-2000 9-11-9-27
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

By preference, I just want to go into my Rampage Formula III's setup, set the profile to XMP and the base clock to 152 (for an i7-950) which I'm running now. My current ram is G-skill Pi DDR3-1600 7-8-7-24 2T with a 2:12 ratio and a 915 DRAM Frequency. Everything is totally stable in Prime95.

So, which is better or are there any other suggestions?

Please note, the dual fans on my CPU tower cooler blocks me from using all 6 slots.

More about : xmp overclock timmings speed

a b K Overclocking
December 31, 2010 2:03:46 AM

Hello,

Well, if you go with the 2000MHz one, be certain you can run it at that speed. From what I can see, you've got a base clock of 152.5MHz for your CPU (which is quite low for an i7 950, you can easily get to 200MHz). In order to run your memory at 2000MHz with that ratio (2:12), you'll need a base clock of 166.666666666667.
My recommendation would be to go with the PC3-16000 and increase your bclk to 200MHz and decrease your ratio to 2:10. That way you'll be able to run it at 2000MHz. If you're lucky, you might even be able to push your ratio to 2:12 and run it at 2400MHz (but you might have to increase the timings).
As for the timings...A latency of 9 for 2000MHz is very good. You might be able to lower it to 8, but I doubt it.
Even if you don't plan on running it at 2000MHz, I'd still go with the PC3-16000. Let's say you decide to run it at 1600MHz, you'll be able to lower a lot the timings, maybe even obtain a latency of 6-7.

The "war" between a higher frequency and lower timings has always been there...The best you can do is find a good compromise between the two. A latency of 8-9 for 2000MHz memory is very good.

In gaming (it's a little less true in benchmarks, where lower latency means higher scores), you won't be able to tell the difference between PC3-12800 running with a CAS of 6-7 and PC3-16000 with a CAS of 8-9.

If you're running application that needs lots of RAM, and need to access it very fast, go in the middle range with the PC3-12800 or lower (the lower your frequency is, the lower the timings will be, generally speaking). You'll see a notable difference in response time.

I hope this helped you,
al360ex
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December 31, 2010 2:14:07 AM

I'm running at 152.47 bclk because somebody smashed the expansion slot tool-less locking pins in my case; so right now my mobo is sitting on its retail box until I get new pins and the only thing providing any airflow to the board is my central ac and my tower cooler. Temps are 41-44 at idle and were 66 dropping to 63 in Prime95.

All those subtimings tend to make me nervous when it comes to manually plugging them in.

Is there any disadvantage to increasing the ratio? if I got the the DDR3 2000 couldn't I just raise the ratio to 2:14 or 2:16?

Are there any alternative 12gb ram sets in the 250 or less price range that would be better?
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a c 347 } Memory
a b K Overclocking
December 31, 2010 2:15:34 AM

Welcome to Tom Forum! :) 

Never do I or will I recommend Patriot RAM, it's the most problematic RAM in 'this' forum. Also, I wouldn't run 2000 MHz RAM unless the BCLK is >= 160 the disparity between RAM Speed and CPU IMC is too great and often causes more problems.

Corsair Tested RAM {R3E & R3F} http://www2.corsair.com/configurator/product_results.as...

My picks:
3X2GB - TR3X6G1600C8D http://www.newegg.com/Product/Product.aspx?Item=N82E168...
3X4GB - CMP12GX3M3A1600C9 http://www.newegg.com/Product/Product.aspx?Item=N82E168...

New
3X4GB CMZ12GX3M3A1600C9 http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.corsair.com/memory-3/intel-memory-solutions/...

IF you're dead set on 2000 MHz:
3X4GB CMT12GX3M3A2000C9 http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.corsair.com/memory-3/intel-memory-solutions/...

IF you want 24GB:
CMP24GX3M6A1600C9 http://www.corsair.com/memory-3/intel-memory-solutions/... You'll need to buy directly from Corsair.

or

F3-12800CL9T2-24GBRL http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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a c 347 } Memory
a b K Overclocking
December 31, 2010 2:22:51 AM

teenyman44 said:
I'm running at 152.47 bclk because ...
Is there any disadvantage to increasing the ratio? if I got the the DDR3 2000 couldn't I just raise the ratio to 2:14 or 2:16?

Are there any alternative 12gb ram sets in the 250 or less price range that would be better?

X58/1366 uses 'multipliers', ASUS unlike Gigabyte calculates the 'numbers' DRAM Frequency -> DDR3-1600/DDR-2000, etc. So get ratios out of your mind. You can under clock the DDR-2000 MHz {1066~2000 MHz}.

Yes, the CMP12GX3M3A1600C9 are $250. I was looking-up all the stuff while there were other posts.
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December 31, 2010 2:35:43 AM

That's the one part in my setup profile I did not leave to auto other than bclk after setting it to XMP. I selected 1830 which works out to a 2:12 ratio as shown in cpu-id
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a c 347 } Memory
a b K Overclocking
December 31, 2010 3:19:31 AM

Again, ratios don't apply for your MOBO. The only 'issue' is disparity between RAM Speed and CPU {via BCLK}. Ignore CPUz info it's gibberish in your case.

Also, you don't want disparity of CAS, it's a sign of cheap RAM IC's especially with 1600 MHz RAM. Example 9-9-9-24 is typically faster than 7-9-7-21.

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


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