View Full Version : A64 S939 Memory Matrix

01-05-05, 10:30 AM
Was browsing over at Anand (http://www.anandtech.com) and found an excellent review by a forum member comparing A64 synthetic & realworld performance using cheaper LL ram vs the usually more expensive high bandwidth ram. Its a very good read (http://forums.anandtech.com/messageview.aspx?catid=28&threadid=1475190&STARTPAGE=1&FTVAR_FORUMVIEWTMP=Linear) for those still considering their next ram purchase.

01-05-05, 10:37 AM
Fascinating. That certainly opened up my eyes. I guess bandwidth isn't the be-all, end-all. Thanks a bunch for finding this, and I think this should be front page material.

01-05-05, 10:47 AM
nice work by the guy... and nice find juice...


01-05-05, 11:37 AM
Awesome. Basically anything over DDR400 is kind of a waste of cash when using an A64 setup.

01-05-05, 12:55 PM
Yup, that guys hard work is gonna save several of us some extra $$ down the road ;)

01-05-05, 01:02 PM
Yes, definitely an interesting read. I don't know about everyone else but I never expected to see more than a few extra fps in most games when using the more expensive (LL/higher bandwidth) memory. So this doesn't really surprise me much. That said, I agree with the assessment below:
the couple game tests which slow slight inprovement with bandwidth or LL, I think you're much better of upgrading to the next tier of video card if on a budget instead of investing with overpriced ram.
By all means... If the choice comes down to nice RAM or a 6800GT vs. the budget card - put your money on the video card instead.

If you can afford both then get both. :)

01-05-05, 01:14 PM

This means I can probably keep my ram for another year or two since it runs at PC-3200 cas2.5 just fine :D

01-05-05, 01:24 PM
Nice read. :D
Thanx JuiceZ. :D

Well, would my Geil UltraPlat 4000 work ok in a 64 rig?
My timings are. 2.5 7 4 4 at 500Mhz.
My ram is made for the 875 chipset boards more than AMD.

01-05-05, 01:38 PM
logically... the type of memory should not make too much difference on an a64 platform..

I noticed a nice performance improvement with my 865 setup going to dual channel... with 939 platforms its a nice theoretical and synthetic improvement but you don't notice much by way of real world gains...

with an on-die controller... it eliminates many of the traditional bottlenecks which led to the evolution of memory in the way we see it today...

01-05-05, 01:49 PM
Looks like I made the right decision in buying 1 gb of cheap generic PC3200 3-3-3-8 Hynix ram for my Athlon64 S939 3200+.


01-05-05, 05:13 PM
I only run my ram at like 188MHz(133 divider) and performance is super(I get about 5300 in sandra). It's a lot faster than running at 2.65GHz with the 166 divider(220MHz ram) that is for sure.

01-05-05, 07:00 PM
/me hugs his cheapish GEIL Value DDR 400 512MB memory modules :p

thnx JuiceZ for the link. At least I can divert that money I had been saving up to purchase a new PCI E mobo+card :) ...in a few months time :)

01-05-05, 07:35 PM
I diverted the funds to buy some G.Skill memory into some much cheaper Corsair PC4000. With the money left over, I was able to pocket $35 in cash and pick up two anime DVDs I've been wanting.

This Corsair performs much better than my old PMI stuff and my actual out-of-pocket cost after selling the PMI to a friend was about $25. :D

01-05-05, 07:41 PM
Whoa, now I can keep my RAM and run 200MHz 2,2,2,10 with dividers. Nice.. I was going to keep it anyway, but wanted to try and stay with 1:1, which of course would only get me to 240-250MHz FSB max and with crappier timings. Not anymore :)

01-06-05, 12:15 AM
Can someone tell me how to get to 166 MHz on the memory speed on an Asus A8V deluxe? I can only go 200 MHz and up. There isn't a 6:5 option for 166 MHz, only 1:1, 2:1, 3:2:, 4:3, and 5:3.

01-06-05, 12:53 AM
set it on Auto? I dunno about that but give that a try?

01-06-05, 07:02 AM
set it on Auto? I dunno about that but give that a try?

Auto goes 1:1 so that's not going to work.

To try and get as close to 166 as possible, he would have to use one of the other dividers. Just do the math in your head before you set them.

01-07-05, 05:47 AM
really? would it not read the memory module spd or whatever? hmm curious

01-07-05, 07:45 AM
Clock speed isn't set by SPD. Just timings..

01-07-05, 08:19 AM
ah p00p...I forgot! cheers for the headsup

01-23-05, 11:05 PM
Thanks! :nanahump:
I plan on building a new Athlon 64 3500+ system in a few months. I was originally looking at the Corsair XMS Extreme Memory DDR PC-3200, but now that I have seen this I will purchase the Corsair Value Select DDR PC-3200 instead. So this saved me about $63 dollars. :D

01-26-05, 03:55 AM
Ok, I got a P4c 3,2 Ghz
on Asus P4C800E-deluxe 875P BIOS 1019
2Gb of Corsair DDR500 Twinx ram set by spd 3-4-4-8

Now.....the mobo doesn't do DDR500 in the first place. The P4 3,2 won't go higher than 215, so it won't do 1:1 with the RAM.

Am i better off to resell that 2Gb of DDR500 to replace it with 1Gb Corsair PC3200XL Pro ram CAS2 ? Advice ? :(

01-26-05, 06:14 AM
nice to see my Crucial Ballistix owning all (test system 5) in the anand review.

interesting that not much is gained above PC3000 - looks like decent DDR400 is all you need, timings are a bonus at best - interesting.

my Doom3 benchy gained 12 fps @ 1280x1024 when upgrading from generic DDR333 to the Crucial Ballistix DDR400.

02-02-05, 12:38 AM
Can someone tell me how to get to 166 MHz on the memory speed on an Asus A8V deluxe? I can only go 200 MHz and up. There isn't a 6:5 option for 166 MHz, only 1:1, 2:1, 3:2:, 4:3, and 5:3.

YOu want 5:3. 5:3 = DDR333