Ram for best performance in an A64

Messudieh

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Nov 9, 2004
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Come Christmas time I'm going to be getting myself a new A64 939 90nm system. As you can tell by my signature, I'm all about overclocking and performance for my computer.

So...the question is: which will give me better performance? A lower FSB (~200) with tight timings and a 1T command rate, or a much higher FSB (~250-275) and what will most likely be more relaxed timings and a 2T command rate. Going with all of my experience with my current AXP system I was going to be just raising my FSB about as high as I can, lowering the timings, and probably lowering the multiplier. However, I stumbled across this article and it threw me a little:

http://www.insanetek.com/index.php?page=overclocka64

After reading over it a little more, it seems the article (to me) is somewhat flawed, especially when you look at the first table of results, but I'm looking for other oppinions here too, especially since I have had no experience with an A64 yet. Also, keep in mind these things:

- I will be watercooling the processor, and I have no problems with raising voltages if it'll give me more performance (probably in the form of MHz)
- I am going to be getting an A64 (probably a 3000 or 3200 90nm), not a FX.

It actually seems sort of like a no brainer to me the more I think about it, since I will need to raise the FSB significantly to get the core running at its full potential with (most likely) higher voltages and (definitely) water cooling. And the multiplier will probably stay pretty close to its default setting too (it obviously won't be able to go higher).

In the end though, I am just looking for some experience from people who have used an A64 and what's worked well for them. Especially with increased FSB vs command rate. Post your thoughts.

*edit* this might have been better in the 'highly technical' category, but I didn't see it at the time.
 

cryptonomicon

Senior member
Oct 20, 2004
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Somehow I don't think a 250 HTT would be really high. From what I have heard (and tried), the platform can reach those frequencies easily, sometimes with no burn in. And with burn in you should be pushing 270. Not sure if this is just for bh-5 though (most stuff is TCCD now i believe).

For reference I have some older "value" corsair pc2700 (ddr333), which the SPD rates at 2.5-3-3-7
It can run perfectly at ddr450 speeds gg memtest86 at 2-2-2-5 (only 225 HTT for me ATM).
Personally, based on seeing how nice some ddr modules can burn in, I think pc3200-pc4000 is a good choice. (hey if someone has the million dolla OCZ pc5400, plz gloat over how much better it is)

Not sure about the cpc (running 1t vs 2t), but if you run 2 sticks it will default to 2 but i think you can tweak it to 1?
 

Messudieh

Member
Nov 9, 2004
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Well, 250 coming from someone who's never gone past 200. It'll probably be closer to 260 or 270 though. That's what the memory I'm looking at can do. It's PQI Turbo 3200 @ 2-2-2-5-1T. It is TCCD, and it's been reviewed to go at about 270-275 with relaxed timings.

And I guess that pretty well answers it, because I will have 2 X 512. I think I would need to run it at 2T anyway to get a high FSB like I'm looking for. Thanks.
 

drpootums

Golden Member
Oct 22, 2004
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I'd go with the PDP Patriot pc3200. It's cheap (about $170-180 usually on newegg) for the 2x512 pack. It's a very good performer, has low latencies (2-3-2-5) at 200, and from each review i saw can go up to about 260 or so at least. It's what i'm getting, and it even has the Red White and Blue ram sink ta' boot!
 

Messudieh

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Nov 9, 2004
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Originally posted by: Concillian
Look at the Anandtech A64 memory reviews.
Here's a great example:
http://www.anandtech.com/memor...c.aspx?i=2226&p=12

300 MHz at 2T is about equal to 267MHz at 1T, with CPU speeds equal. So it takes a pretty large FSB difference to make up for the command rate being 2T.

And that's the exact sort of comparison I was looking for. Thank you! I actually read that one a while back, but didn't realize it's exactly what I'm looking for in a review until you brought it up here. It's even got the ram I'm looking for: the PQI Turbo 3200. It looks to me like the OCZ is definitely the winner, but the PQI looks to be right in the middle or just a little above. I guess now it's time to compare prices for what I want to buy. But that does answer a few important questions for me, especially that you can (with good RAM) go with a high memory speed and still keep the 1T command rate.