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DDR2 vs. DDR?

Last response: in Components
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March 9, 2006 3:52:48 AM

My Set-up:
P4 630 3.0Ghz
Asus P5GDC Deluxe MB 915 chipset
1 gig stick "Lifetime"? PC4200 533Mhz DDR2
Western Digital 120GB 7200rpm 8MB cache SATA II HDD
Leadtek 6800GS Extreme 256MB PCI-Express

I have the oppertunity to switch out the 1GB stick of DDR2 for a 2 x 512MB kit of Patriot PC3200 400Mhz DDR. First off, I can run the DDR kit in dual-channel. Secondly, the timings on the DDR2 is 4-4-4-12, while the DDR is 2.5-3-3-7. Will I get a performance boost from switching the RAM or am I better off keeping my set-up? I've read some reviews that say that unless you get DDR2 with low timings, DDR is actually faster. Anyone had any experience with both set-ups?

More about : ddr2 ddr

March 10, 2006 4:48:42 AM

You'll get more benefit from the bandwith of DDR2. Anyways getting the DDR would require a motherboard change.
March 10, 2006 6:45:20 AM

Did you look at his board before saying that? 915 chipset supported both DDR and DDR2. Yes, I said both. Some boards had two sets of slots, others didn't.
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March 10, 2006 2:28:22 PM

I thought that by going with the DDR I'd be able to go dual-channel and increase my bandwidth that way. Also the timings on the DDR are better even though it is a little slower. My board definently supports both DDR and DDR2 so what do ya think?
March 10, 2006 2:38:46 PM

DDR2 is good to go my man. AMD is already coming up with it maybe late this year or early next year. AMD with DDR2? That's a good performance increase!!!
March 10, 2006 6:32:10 PM

All right so I got my hands on the DDR and installed it. Here's the results, but to be fair the DDR2 is a 1GB stick while the DDR is ran dual-channel.
DDR2 vs. DDR
mem read=3971 MB/s / mem read=5601 MB/s
mem write=1620 MB/s / mem write=1906 MB/s
mem latency=100.9 ns / mem latency=98.6 ns
bandwidth=4267 MB/s / bandwidth=6400 MB/s

3DMark 05=5705 / 3DMark05=5724

Not a big upgrade, but in this scenario(being free) it did give a boost. My sytem has always been very responsive so it's difficult to tell. I haven't had time to try any intense gaming to see if my fps are any higher. When I go 2GB I will probably shell out the extra dough for the DDR2.
March 11, 2006 4:41:09 AM

I think DDR is better in AMDsystem ,the memory controler on die .intel need DDR2 667 or higher! DDR2 533 is actually slowly!
March 11, 2006 5:07:10 AM

Of course you're completely wrong, HERE'S A REVIEW showing DDR2-533 beating CAS 2-2-2 DDR400!
March 11, 2006 5:48:22 AM

Crashman:
your example is based on Foxconn NF4SLI7AA-8EKRS2,that's an intel system mb,i emphasized that DDR400 is better in AMD system ,so the intel cpu can not boost it greatest performance ! i mean ,there are two system ,one is AMD CPU with DDR400 ,an other is intel's CPU with DDR2 533, you test again! DDR400 will beat 533!because DDR2 533 with higher-Latency
March 11, 2006 5:55:52 AM

But AMD has planned already about going DDR2. So that means DDR2 are better otherwise AMD will stick to with DDR.
March 11, 2006 6:06:05 AM

Quote:
.intel need DDR2 667 or higher! DDR2 533 is actually slowly!


Like I said, competely wrong, on the P4, DDR2 533 is also faster than DDR400.

Early benchmarks said otherwise simply because they used some crazy high-latency CAS5 DDR2 or something and compared them to CAS2 or 2.5 DDR.
March 11, 2006 12:57:31 PM

As you can see from my earlier post, the lower latency DDR 400 ran in dual-channel out performed my single DDR2 533 in every aspect on Intel P4(specs in first post). Obviously, if you spent $300 on performance DDR2 667 with latencies of 3 or better, I would hope it would win. However, in my scenario whatever speed advantage the DDR2 533 had was completely overshadowed by the lower latencies and increased bandwidth of the DDR in dual-channel. Last night I played a bunch of games to test out the new RAM. With the DDR2 when I played F.E.A.R. with the settings maxed I would occasionally get a slight lag when entering a new room with lots of action. I played a number a levels with the DDR 400 last night and tried to make it lag, but I couldn't. :D  Also when I would exit the game with the DDR2 my system would be slow for about 30 seconds, that is also gone with the DDR! All other games (BF2, COD2, Farcry, Doom 3) played pretty much the same. I'm not saying DDR2 sucks(I still have a stick in reserve), but I don't think that there is much advantage(if any) with DDR2 533. When I upgrade to 2GB I will probably go with DDR2 667 and try to overclock the latencies.
March 11, 2006 6:26:48 PM

Lag is real time, latency is measured in cycles. The real time latency equivalent to DDR400 at 2-2-2 is DDR2-600 at 3-3-3 and DDR2-800 at 4-4-4. So DDR2-533 at 3-2-2 is quicker, and so is DDR2-667 at 3-3-3.
March 11, 2006 7:00:13 PM

I wasn't aware you could interchange the 2 memories, but even if you can you should stick with ddr2.

Oops. Nevermind. I didn't scroll down to see the other replies.
March 11, 2006 7:34:13 PM

several first-generation P4 PCI-Express chipsets support both DDR and DDR2 memory, it's up to the board manufacturer to choose which slots to include.
March 11, 2006 8:35:06 PM

That must account for why I got less than a 2% decrease in latency time. It is interesting thou that I such large gains in other areas. 29% in memory read, 15% in memory write, and 33% in bandwidth! Maybe my DDR2 stick just sucks? There is no doubt I am seeing a performance increase when playing F.E.A.R. When I upgrade my board I'll probably have to go with DDR2 but having the option of both makes for a nice way to test different RAM in the exact same setup. I think it proves that the increase in speed from 400Mhz to 533 isn't enough to overcome the increased bandwidth due to running DDR in dual-channel.
March 11, 2006 8:37:04 PM

Er, you were running DDR2 in single channel mode? Ouch.
March 11, 2006 8:41:59 PM

1GB stick. If the DDR wasn't free I would have never even thought to try the switch. Glad I did.
March 12, 2006 1:05:30 AM

LMAO, comparing DDR2 in single-channel mode to DDR in dual-channel mode. Hey, it's a good thing for free stuff, or you'd be spending a bunch more money to get a matching stick of DDR2!
!