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Old October 30, 2009, 06:45 PM
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Default DDR2 vs. DDR3 proportional latency/frequency, same performance?

Hi guys, I was wondering if ddr3 and ddr2 practically perform the same, if ddr3 has double the latency and double the frequency of a ddr2 module

Yes I googled, a review site said that's basically the case, but then I don't understand what's the point of ddr3 other than lower voltages... I believe ddr3 runs just as hot
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Old October 30, 2009, 09:09 PM
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If you compare it at (example) DDR2:1000 @ 7-7-7-18 vs. DDR3:2000 14-14-14-36, your results probably wouldn't be too different.
But the thing is, real world DDR3 is less than double the latency of DDR2. You can hit DDR3:2200+ at 9-9-9-24

Stock G.Skill Trident (6GB kit) is stock at 1.60v DDR3-2000 9-9-9-24

Supertalent has a 4GB DDR3 kit that runs at DDR3:2200 stock at 1.65v 8-8-8-24

It was the same thing between DDR1 and DDR2. DDR2 was so pitiful when it was released. Considering I could have DDR600 at 3-3-3-9 that would rape any DDR2 on the market. The Samsung TCCDs put DDR2 to shame. BH5 memory if you didn't mind ultra high voltage to your memory. DDR2-400 was released with latencies of 4-4-4-12 while DDR1-400 at the same was generally 2-2-2-8 or so.
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Old October 30, 2009, 11:51 PM
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on a 775 board your gain is small going to ddr3
800mhz=-6000-7000mb/s
10000mhz=8000-9000mbs
12000=10000-12000mbs
for ddr3 you need 1800+ cas 7 to see somethin nice

i7 and i5 bandwidth is doubled and trippled my i7 860 is @ 20000mb/s
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Old October 31, 2009, 08:49 AM
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I think you meant to take a zero off of those numbers zsamz

so with those numbers, I think I'll put off ddr3 for my next build and stick with ddr2 for now... thanks for the replies :)
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Old October 31, 2009, 04:05 PM
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DDR3-1600 would give about twice the bandwidth as DDR2-800 and likely with a similar latency (8-8-8-24 would be exactly double 4-4-4-12). Also I've seen a lot of DDR3 that is capable of running at 1T instead of 2T (compared to DDR2) which gives a decent bump in bandwidth.
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Old October 31, 2009, 06:22 PM
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The memory timings aren't the only source of latency - a processor with an IMC will have lower latency at the same timings than a processor with a seperate memory hub, which is why an i7/i5 board will still have better latency than a 775 baord with DDR3. And of course, AMD's had that advantage for awhile now.
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Old October 31, 2009, 07:15 PM
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Quote:
Originally Posted by MpG View Post
The memory timings aren't the only source of latency - a processor with an IMC will have lower latency at the same timings than a processor with a seperate memory hub, which is why an i7/i5 board will still have better latency than a 775 baord with DDR3. And of course, AMD's had that advantage for awhile now.
Sadly, they couldn't come up with anything innovative to be manage to beat Intel, once Intel integrated the memory controller.
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Old October 31, 2009, 11:12 PM
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Quote:
Originally Posted by CanadaRox View Post
DDR3-1600 would give about twice the bandwidth as DDR2-800 and likely with a similar latency (8-8-8-24 would be exactly double 4-4-4-12). Also I've seen a lot of DDR3 that is capable of running at 1T instead of 2T (compared to DDR2) which gives a decent bump in bandwidth.
only in i5 and i7 not socket 775
and to be quite honest i'm not impressed with i7 lol
woopdidoo i got 22000 read in everest latency of 35
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