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Last S939 upgrade, CL3 to CL2; worth it?!

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Last response: in CPUs
February 18, 2007 6:38:27 PM

I started my build in May 2006, when Socket 939 was the top performer and open upgrade path, affording only the cheapest components; a 3000+, and common CL3 DDR400. Now, after upgrading to a good 4200+, I see some interesting price drops on the DDR400, so was wondering what benefits could bring switching from my current CL3 to CL2 DDR400 taking into account that:
-This build will probably last me another year at least
-I do photo-realistic rendering and photoediting
-I'm not a gamer
What can be in average percentage the benefits of CL2 vs CL3 RAM on the 4200+?!

P.S: Sandra2007 reports a drop of bandwidth on the 4200+ compared to the 3000+ (~4300 vs ~4600)

More about : s939 upgrade cl3 cl2 worth

February 18, 2007 7:08:12 PM

I'd say save your money. Unless you must have the best or you think it will really help your productivity...not worth it, man.
February 18, 2007 8:23:22 PM

really not worth it, in my experience decreased latency in RAM really only makes a difference in synthetic benchmarks and even then not by much
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February 18, 2007 9:04:12 PM

Assuming that you could actually get cas2 with that OC, a lot would depend on how much rendering etc you have to do.
Since you mostly do memory intensive progs, you are probably looking at a speedup in the 5 to 10% range.
I wouldn't worry too much about Sandra's bandwidth test. AMD's dual cores are no where near bandwidth starved.
Here's something you might try. Run a render @ stock speed, highest latency. Then run the same render @ stock speed, lowest latency ( Since you ram does cas3 @ ~ 220, you can probably do cas2.5 or maybe even cas2) That should give you a good idea of the benefit.
Remember though that cas2 @ DDR400 may not work at cas2 @ DDR440.
February 18, 2007 9:13:18 PM

Remember though that cas2 @ DDR400 may not work at cas2 @ DDR440.

I don't OC RAM, only the CPU (have dropped the RAM to 366 instead of 400 and now on HTT 223 it runs about @ 400). I was planning to do the same with CL2 RAM but if it gives no better results than 5-10% I'm not thinking about it any more.
February 18, 2007 9:28:07 PM

I was planning to do the same with CL2 RAM but if it gives no better results than 5-10% I'm not thinking about it any more.

Now, when we're keeping the clock frequency at 193 MHz and changing the timings from CL3.0-4-4-7 to CL2.0-2-2-6 - settings you probably would use when running DDR600 and DDR400 respectively - we see a difference of 5.1% and 5.7%.

5% is practically negligible. I would definately save the cash,
February 18, 2007 9:45:32 PM

I would check youre current OC capibility, i have a 4200+ OC to 2.5GHz and it runs great on PC3200 ram, i think the timings are 3-3-3-12 ( but i could be wrong and im too lazy to check cos i just bought an E6400, Asus P5N32-E SLI and XMS 6400C4 ram :) 

Anyway, post your sandra results and ill give you a comparison if you like
February 18, 2007 9:55:34 PM

I have sent my 4200+ well past 2.5GHz; near 2.6GHz, even more with the 3000+ but that was on an old IDE HDD; HTT 246 out of an A8V-MX 8O
Unfortunately, on my board all the SATA channels get a protective lock beyond HTT 224, so I was kind of cursed with the new SATA HDD :cry: 
February 18, 2007 10:28:49 PM

If you're not gaming then it seems a rather irrelevant upgrade tbh. It will reduced load times of programs slightly but that is it, really not worth it.
February 18, 2007 10:56:47 PM

Have you tried changing the timings on the ram you already have? If you have it running slower than 400 you might be able to go to 2.5 or even 2.0 if you are lucky.