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A doubt.....

K

kidoman

n00b
Joined
Apr 2, 2006
Messages
16
Hi guys,

Pls clear this doubt for me will ya?



I am seriously considering buying the SevenTeam 750EAJ but it has about 16A on each rail (with 18A on the last rail.)

If the Opteron 165 alone is sucking off 188 W (thats 188/12 = 15.66A) of a single rail then how is it enuf? That way, the SilverStone Zeus 650W is not even close to adequate as the 12V1 rail in it supplies 13A to the CPU (EPS12V connector, 12V2 supplies in case of a second CPU.)

Hope you pros can shed some light?

Regards,

Karan
 
Where did you get "188W" from?

And "only" 16A per rail isn't a big deal when you consider there's four of them.

Would you rather have only two with 20A each if the total combined wattage is half that of the 750W?
 
Oh... That's a screen shot of the eXtreme PSU Calculator, isn't it?

Now I know who you are. You came on my website and asked me the same thing. I said that I think the eXtreme Calculator was wrong.

In fact, it looks to me like that number was obtained by taking the core voltage of a single core Opteron and doubling it, which isn't realistic because it simply wouldn't be double and the default core voltage for the CPU is actually less than an equivalent speed single core.

I'm willing to admit I'm wrong, but is the eXtreme PSU Calculator the only source you have for the maximum wattage of an Opteron 165?

All due respect to the creator of the calculator, but you do realize that it's just the creation of a very dedicated enthusiast, right? (Someone w/ way more time than me.)
 
Quoted from a discussion about the ridicuolously high maximum wattages of dual core Xeons on C|Net

In contrast, AMD's Opterons--single- and dual-core--consume a maximum of 95 watts, though the company sells faster 120-watt "special edition" models to Sun Microsystems. It also sells premium Opterons that use only 68 watts but that run at 2.2GHz, a step shy of the the current 2.4GHz top speed of mainstream Opteron models. Those premium models are used in IBM and HP blade servers, and a 2.4GHz version will go on sale to select customers in the first quarter of 2006, spokesman Phil Hughes said.
Click to expand...
 
jonnyGURU said:
Quoted from a discussion about the ridicuolously high maximum wattages of dual core Xeons on C|Net
Click to expand...

hi jonny, i am the same guy :D

well hv a look, from AMD themshelves: http://www.amdcompare.com/us-en/opteron/details.aspx?opn=OSA165CDBOX

agreed the other breed of processors (2xx and 8xx series) are rated at lower TDPs, but this 1.8 Ghz dually is also rated at TDP of 110W. Thats the minimum "max" load of the CPU at 100% utilization.

jonnyGURU said:
In fact, it looks to me like that number was obtained by taking the core voltage of a single core Opteron and doubling it, which isn't realistic because it simply wouldn't be double and the default core voltage for the CPU is actually less than an equivalent speed single core.
Click to expand...

Hmm, when i put at stock, it does show 95W:



pls throw some light in this issue.

OT:
also on another note, jonny u hv never reviewed any Seventeam PSUs (albein the Styrin 460W). can u give ur views on this PSU (its compatibiltiy with ultra-d) and also something this:

XClio 750W

regards,

karan
 
kidoman said:
....jonny u hv never reviewed any Seventeam PSUs (albein the Styrin 460W). can u give ur views on this PSU
Click to expand...

Seventeam isn't sold as Seventeam in the US. So finding their product is like finding a needle in a haystack.

MGE (as XG), Cooler Master and Sytrin all use Seventeam. Maybe now that they're moving into quad rail units and passing up some of the competition, we may see more models.
 
kidoman said:
well hv a look, from AMD themshelves: http://www.amdcompare.com/us-en/opteron/details.aspx?opn=OSA165CDBOX

agreed the other breed of processors (2xx and 8xx series) are rated at lower TDPs, but this 1.8 Ghz dually is also rated at TDP of 110W. Thats the minimum "max" load of the CPU at 100% utilization.
Click to expand...

There's a big difference between 110W and 188W.

If you were to overclock with a 1.55V core and do the math, you'll find that you're max power consumption is only 126W. That's only 10.5A on the 12V rail.
 
jonnyGURU said:
There's a big difference between 110W and 188W.

If you were to overclock with a 1.55V core and do the math, you'll find that you're max power consumption is only 126W. That's only 10.5A on the 12V rail.
Click to expand...

hmm pls give me some hints about how i shud approach this math?
 
jonnyGURU said:
Seventeam isn't sold as Seventeam in the US. So finding their product is like finding a needle in a haystack.

MGE (as XG), Cooler Master and Sytrin all use Seventeam. Maybe now that they're moving into quad rail units and passing up some of the competition, we may see more models.
Click to expand...

jonnyGURU @ website said:
When I tested the Asus Atlas A-55GA 550W a couple months ago, I had mentioned that it was the same Acbel Polytech unit as the Cooler Master Real Power 550W
Click to expand...

:confused:
 
Whoa.. Chill out.

Not all Cooler Masters are Acbel. Not all XG's are Seventeam. Not all Ultra's are Wintech.

There was nothing wrong with his answer.

I think I'm just going to get out of here before my head explodes. Between you and V3|!UM my weekend has kicked off badly.

And to answer your question about the "math"...

W / V = A

A * V = W
 
jonnyGURU said:
Whoa.. Chill out.

Not all Cooler Masters are Acbel. Not all XG's are Seventeam. Not all Ultra's are Wintech.

There was nothing wrong with his answer.

I think I'm just going to get out of here before my head explodes. Between you and V3|!UM my weekend has kicked off badly.

And to answer your question about the "math"...

W / V = A

A * V = W
Click to expand...

rofl man.... i wasnt attacking him or anything. if you/him felt like that, then am sorry.
:p

ok i am aware of that math, just not how u imply i should use it in this context. please shed some light :confused:
 
hey guys a little update:

evidently the POWER REQ of a overclocked processor is calculated as this:

Overclocked Power = Stock Power * (Overclocked Speed/Stock Speed) * (Overclocked Vcore/Stock Vcore)^2

Which indeed puts the power requirements of an Opteron 165 @ 2700 @ 1.55Vcore = 200W.

Please confirm.

Jonny, is this correct?
 
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