FSB and AMD CPU's

[Netopia]

Greetings all,

I'm considering getting an NF2 based system and I'm at a fork in the road regarding the CPU. I'd like to use PC2700 and would therefore like the FSB and memory to both be at 166. If I go with a Barton core, then the CPU would utilize the additional FSB speed, but if I go with... say a T-Bred 1700+ overclocked and running on a 166 FSB, isn't it true that it won't actually get any performance boost from the extra 33MHz on the FSB? IIRC, isn't that why AMD came out specifically with a core that would actually use a faster FSB?

Thanks in advance,

Joe

 

[Ymeister19]

if u buy a 1700 and turn the fsb up to 166 as opposed to the 133 that it runs stock there will be a performance gain, but beyond this the barton 2500 has 2wice the L2 cache which according to most people gives about 5% performance boost, either of these chips will overclock extremely well with the 1700 having the better % overclock, with a 1700 u can exspect up around 2ghz-2.2 some people with exceptionally good cooling have reached speeds of 2.5 ghz, with the barton u can exspect 2.2-2.3 ghz at default vcore, these are the speeds these chips will do, unfortunately u wanna stick with pc2700 which really puts a damper on these chips ability, if u can go with the cheeper 1700 and invest in some new ram, pc3200 is resonably priced and will be more than enough unless you are looking for some serious FSB overclocking, but hey with that 2500+ barton u can prolly hit 230 fsb good luck making your choice, personally i like the barton better just for the fact you can achieve 3200+ speeds on low vcore and u get the extra L2 cache

 

[mechBgon]

Good to see you pop to the surface Netopia Just by going from 133MHz to 166MHz, you gain about a 5-7% performance boost per MHz, judging by Hexus's results with an AthlonXP 2400+. They ran it at both FSB's, adjusting the multiplier to hold it at 2.0GHz. link

 

[Netopia]

One more thing to throw into the miss is that I'm going to be sticking this in a Shuttle XPC box. From what I've read, the Barton Core runs hotter (17M more transistors) than the T-Bred. Because of the cramped quarters, that is a major concern.

As to the PC2700... I've got two brand new 512MB sticks sitting unopened on a shelf, so I don't think I'll bother to run out and get more, even for the OC capabilites. If I can hit 2GHz with either chip, I won't be crying by any means. I just found that Excalbierpc has the 1700+ with a guarenteed DLT3 core (1.5v) for a somewhat pricey (by today's standards) $63. I might go with it anyway since the lower voltage should mean both a hair more overclocking room and also cooler temps.

mechBgon... thanks for the warm greeting! Hope all is well with you and yours. Still cracking/crunching/deciphering?

Joe

 

[Netopia]

DOH!!!

Just noticed your sig!

Joe

 

[Jeff7181]

Along with the increased transistor count of the XP2500, the core size is increased, which means more area for heat to be dissipated through. I'd still go with the XP2500... lots of them, including mine, are running 2.2 Ghz on default (1.650) voltage. Mine only goes above 50 C when room temp is above 28 C. And even then it goes to 51.

 

[Netopia]

I think what I'm going to do is to get the 1700+ now (this is going to be an extra PC, not constant use one) and when the price of the barton gets down toward $50 I'll just drop this 1700+ in something else and pop the 2500+ in this.

Joe

 

[Jeff7181]

Originally posted by: Netopia
I think what I'm going to do is to get the 1700+ now (this is going to be an extra PC, not constant use one) and when the price of the barton gets down toward $50 I'll just drop this 1700+ in something else and pop the 2500+ in this.

Joe

Get that extra computer crunching some SETI@Home WU's =)

 

[Netopia]

Get that extra computer crunching some SETI@Home WU's =)

I was a major player in the Original AnandTech Distributed Computing Team..... and that contest is over now. I've got a philosophical problem with SETI (I don't believe there's anything to find) but I have toyed with joining other AT teams.

Joe

 

[Shimmishim]

even though it does have a larger core size, it still runs hotter... my 1700+ @ 2.5 ghz ran 44 max load

my 2500+ @ 2.4 ghz ran over 46 at 100% load...

100 mhz slower yet 2 to 3 degrees hotter...


yeah the difference is small but still!!!!

 

[Netopia]

even though it does have a larger core size, it still runs hotter... my 1700+ @ 2.5 ghz ran 44 max load

Do you know what stepping that CPU is?

Joe

 

[mechBgon]

Remember that with a Shuttle XPC, the CPU's heat is escorted right to the rear of the case via a heat-pipe, where the exhaust fan is pulling the heat right out the back.

How about doing some UD Cancer Research instead of S@H? I did a stack o' FAQs for AndyHui around January, you can find the results here