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is ddr2 800 4-4-4-12 the same as ddr3 1600 8-8-8-24?

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a b } Memory
October 26, 2007 8:20:58 PM


from a performance standpoint (games), will DDR2 800 CAS 4-4-4-12 have similar performance to DDR3 1600 CAS 8-8-8-24? Or is there more to DDR3 in terms of bandwidth?

More about : ddr2 800 ddr3 1600

October 26, 2007 9:20:24 PM

I don't know the answer in terms of games, because I don't know how most games access the RAM, but in terms of bandwidth ddr3-1600 >> ddr2-800. The ddr3 would never perform worse, unless I'm confused.
http://en.wikipedia.org/wiki/CAS_Latency

Their latency (the time to get the first bit) would be identical, but the higher bandwidths of the ddr3 would send data at a much greater rate. A well designed program should therefore take advantage of this by reading clumps of data from RAM rather than scattered bits of data all over.

The questions that I don't know the answer to is "how much does increasing RAM speed affect game performance?" and "how well are games programmed to take advantage of fast RAM". My guess (unsubstantiated, mostly), is that in terms of FPS, there will be little difference using either of these on a Intel c2d, as the large L2 caches seem to make them relatively resistant to increasing RAM speeds.
October 26, 2007 9:45:06 PM

DDR3 has higher bandwidth but I think DDR2 is much faster in that samples. Why? Most appz or games cannot max out that bandwidth they have. Still DDR2 is a good bet for that for now.
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October 26, 2007 9:59:11 PM

Latency is "the same" (only marginal differences), but performance will be higher with DDR3.
a b } Memory
October 26, 2007 10:39:18 PM

Latency is not the same. I can get DDR2 CAS 3 vs DDR3 CAS 7. From what I've read DDR3 doesn't become faster until DDR3-1600 speeds. DDR3-1067 and DDR3-1333 are slower than fast DDR2 ram. What about amount thrown into the mix? here's my dilema:

mushkin 4gb (2x2gb) DDR2-800 CAS 4-3-3-10, or

Super Talent 2gb (2x1gb) DDR3-1600 CAS 7-7-7-18

I plan on running Vista 64 eventually.
June 5, 2008 2:21:24 AM

I am pretty much wondering the exact same thing! Should I go with a motherboard that accepts a 1600 FSB and go for 1600 DDR3 at CL7 or do I go for a motherboard with 1333 FSB and get double the ram at 800+ CL4?

It's a real dilemna for now, as both seem to be almost identical, the only thing is that I wouldn't be able to upgrade the speed of the ram, seeing that at 1600 DDR3 is already at max of what today's mobo's can take, I could only wait for lower latency ram to replace the CL7... is it worth it? or should I go for lower latency DDR2 and maybe next year just replace the mobo and ram???
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