Two 7900's bottleneck 4000+?

[Tubnotub1]

Hey guys, was just wanting to get some opinions here. I need to know if two 7900's in SLI will bottleneck my CPU, a 4000+ Sandy oc'ed too 2.6. Full system specs are at the bottom of the page. Im sure I have a little more wiggle room on the OC as I ONLY wanted to OC the CPU to 2.6, once i got it there, i stopped oc'ing. So, bottom line, do I get another 7900 (knowing ofcourse DX10 is coming out yadda yadda yadda) or upgrade the proc? Thanks for your advice!

PS. How can one tell if your CPU is bottlenecking your system anyways!?

[Adrynalyne]

Hmmm, you already have a 7900 series card?

Your sig says 7800.

I very much doubt you will be CPU bottlenecked.

[Tubnotub1]

Ordered the 7900 off of newegg last night, so expecting it here at the beginning of next week. Just wanting to make sure that the CPU wont be bottlenecking the system, though I doubted it would, thanks for confirming my suspicions! Ill be sure to post benchmarks when i get it in... maybe ill compare the 7800 series to the 7900, get some solid benchmarks for people thinking of upgrading...

[Raistlyyn]

One 7900 shouldnt be a problem, but i think if you put 2 7900's in, then yeah i think the cpu will become the bottleneck.

[viper_boy403]

id wait until the price drops so go SLI, you can max out pretty much all games with just ONE 7900gtx.....

[Adrynalyne]

Originally Posted by Raistlyyn

One 7900 shouldnt be a problem, but i think if you put 2 7900's in, then yeah i think the cpu will become the bottleneck.

Why do you say that? He's running at FX60 speeds.

[theefool]

Originally Posted by Adrynalyne

Why do you say that? He's running at FX60 speeds.

FX60 is dual core. 4000+ is single core

Which I'm sure you already knew....

Modern video cards do not use the full bandwidth that PCIE is capable of using. Just like when AGP first came out.

If you want links for what I'm talking about, I can give them.

Eventually.....

What ram are you using? 400? 533?

The word bottleneck...hrmmm....depends on what you are talking about.....

[Adrynalyne]

Aye, I know it

I was just mentioning he hit those speeds.

:D

[Tubnotub1]

Ram I am currently using is 2 gigs of Corsair XMS PRO, timings are 2.5/3/3/6. It is 400 currently oc'ed too 434.

[Raistlyyn]

With 2 7900's in SLI, then im pretty sure the CPU will become the bottleneck, as in the video cards will be waiting on the CPU and not the other way around. And yes hes running at "FX60" speeds, but hell a p4 will run at "FX60" speeds. A p4 2.2 runs at that same speed as my amd64 3500. But it doesnt mean that the p4 will out perform my 3500.

[Adrynalyne]

Originally Posted by Raistlyyn

And yes hes running at "FX60" speeds, but hell a p4 will run at "FX60" speeds. A p4 2.2 runs at that same speed as my amd64 3500. But it doesnt mean that the p4 will out perform my 3500.

That was totally irrelevant to this discussion.



He is certainly faster than anything under an FX CPU, almost as fast as an FX57 and on top of that, dual core CPUs don't make the CPU any less of a bottleneck for the video cards.

We are talking AMD to AMD here, not Intel to AMD.

[viper_boy403]

Originally Posted by Raistlyyn

With 2 7900's in SLI, then im pretty sure the CPU will become the bottleneck, as in the video cards will be waiting on the CPU and not the other way around. And yes hes running at "FX60" speeds, but hell a p4 will run at "FX60" speeds. A p4 2.2 runs at that same speed as my amd64 3500. But it doesnt mean that the p4 will out perform my 3500.

yea dude ur a retard (no offense lol) you cant compare AMD to Intel as far as clock speeds go, at least not that way. If u didnt know already, the Athlon 3500 means it runs comparable to a pentium @ 3.5ghz

[Raistlyyn]

/sigh.....nevermind,
[QUOTE]Why do you say that? He's running at FX60 speeds.

Just depends how you define "speed".

[Adrynalyne]

Yep, and Intel and AMD do it differently.

Hence my post.

I don't think anyone can deny that the faster your CPU is, the less the bottleneck.

[Raistlyyn]

Im a retard? /sigh...nevermind. I worded that post funny, but you basically just repeated what i just said.

Originally Posted by Adrynalyne

Why do you say that? He's running at FX60 speeds.

Just depends on YOUR definition of "speed".

[viper_boy403]

Originally Posted by Raistlyyn

Im a retard? /sigh...nevermind.

lol sorry about that

[Raistlyyn]

No problem.

[viper_boy403]

so i guess your saying that they are the same SPEED rather than the same performance...?

[Raistlyyn]

Right.A 4000+ may run at the same GHz at a FX, but the 4000+ cant compete when it comes to performance.

[Adrynalyne]

It will certainly compete a helluva lot better than a 4000+ (and most other things out there), which was my point all along.