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  ACTUAL Experienced Performance Diff between CAS7 and CAS9? 
 
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john albrich May 10, 2011, 02:35pm EDT Reply - Quote - Report Abuse
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Time limited question: 10 hours or so

Anyone able to ballpark how much of a REAL difference I'll actual obtain?
Or, can someone point me to anyplace that has listed comparison benchmarks that show the differences in a given computer between JUST various memory speed ratings?

On the target computer I mostly do Word very large document creation, storage, and editing (e.g. some complex editing macros take over a minute to execute on a 4MB document so you can see any significant performance improvement could help a lot).


DDR3 Memory with specs of:

# Cas Latency: 9
# Timing: 9-9-9-24


# Cas Latency: 7
# Timing: 7-8-7-20

Thanks.


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Sean Costello May 10, 2011, 02:59pm EDT Reply - Quote - Report Abuse
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>> Re: ACTUAL Experienced Performance Diff between CAS7 and CAS9?
are they both the same DDR rating and just have different latencies? If that is the case then the lower would be quicker by milliseconds but that can add up. If the cas9 one has higher ddr rating then I dont think there would be any noticable difference.

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john albrich May 10, 2011, 03:37pm EDT Reply - Quote - Report Abuse
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>> Re: ACTUAL Experienced Performance Diff between CAS7 and CAS9?
Sean Costello said:
are they both the same DDR rating and just have different latencies? If that is the case then the lower would be quicker by milliseconds but that can add up. If the cas9 one has higher ddr rating then I dont think there would be any noticable difference.


They are DDR3

I think you meant nano-seconds (billionths of a second) difference...not milli-seconds, unless you're talking about the final result of some specific benchmark like Prime95 running a specific scenario and number of iterations.


Unfortunately, the final performance difference is not linear. Memory management doesn't work that way, so I can't just assume that because a memory stick has a different parameter means I'll see a 1:1 percentage difference in end peformance. (e.g. CAS7 does not provide 22% faster system performance than CAS9...it might end up being less than 5% all things considered and that would mean it wouldn't be worth the added cost to me).

One real-world example,
I've got DDR3 9-9-9-24 and DDR3 8-8-8-24
I can find virtually no effective difference in the execution times of various programs or program operations between using the two sets of RAM, including when I toss-in substantial multi-tasking. Yes, benchmarks show some difference, but it does not translate to any tangible difference for normal program operations. (mobo=GA880GMA-UD2H, AMD Phenom II X4, SATA 6Gb/s 7200rpm drive).

Thus, I can't see that CAS7 7-8-7-20 would make that much tangible difference in the real-world.


The problem I face is that I don't have any CAS7 (whatever sub-timing parms) RAM to compare. All my current DDR3 memory is either CAS9 9-9-9-24 or CAS8 8-8-8-24.

~Vel May 10, 2011, 04:00pm EDT Reply - Quote - Report Abuse
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>> Re: ACTUAL Experienced Performance Diff between CAS7 and CAS9?
http://www.tomshardware.com/reviews/ddr3-1333-speed-latency-sh...54-25.html

That might help, check out the detailed latencies. If I read correctly, the Mushkin is CAS 9 at 1333 and OCZ Platinum is CAS 7. Comparing the appropriate bars, there appears to be only about 1%-2% difference between the two.

I also did my own benchmarks when comparing 2x1GB dual channel and 4+1GB single channel on my laptop and there was a difference in throughput that was also less than 1% and the only real world difference I notice is in that I'm not getting everything pushed to SWAP.

Short answer: Unless the price difference is like $2, I'd feel comfortable in going with the CAS 9.

~Vel May 10, 2011, 04:06pm EDT Reply - Quote - Report Abuse
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Edited: May 10, 2011, 04:06pm EDT

 
>> Re: ACTUAL Experienced Performance Diff between CAS7 and CAS9?
Dug this up.

http://www.extremetech.com/article2/0,2845,1637769,00.asp

Seems like it still makes a difference of 10 FPS in some cases, but now it's in games with a base line upwards of 300 FPS, lol.


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