X1800 XT Crossfire may require 800w

[NFS4]

http://www.ngohq.com/home.php?page=Articles&go=read&arc_id=49

As you have probably read in the reviews, the new ATI X1000 series require a lot of power. We?ve learned that the X1800XT is a power pig, it can use up to 270w at full load. A typical AMD64 based system requires around 200w in a good case scenario. Two X1800XT cards in Crossfire could demand up to 540w, add this to a normal system power requirement and it could easily reach 740w or more if you use any extra devices.

If you are planning to go with Crossfire and two X1800XT cards, make sure you get a really good power supply. I doubt if there are many 800w power supplies on the market yet but if we know the power supply manufactures, it shouldn?t take long for them to arrive.

 

[thegimp03]

When people posted threads about what power supply to get for their system as a joke I'd always recommend the 850w pcp&c psu. Now I guess I can do it on a more serious note.

http://www.newegg.com/Product/Product.asp?Item=N82E16817703002 !!!

 

[Capt Caveman]

PC Power & Cooling 850

 

[5150Joker]

Wow...just wow. Guess that rules out crossfire for a lot of people

 

[orangat]

That would mean 1500W if the brand is a Xazer, Aspire, X-connect or someother generic crap.

 

[ddogg]

lol amazing....another flaw!!

 

[Fallengod]

Originally posted by: 5150Joker
Wow...just wow. Guess that rules out crossfire for a lot of people

Seriously, who the hell is going to buy a power supply that costs that much for minimal performance gains anyways. I think I will keep my 7800GT that only requires a 300-400watt psu?

 

[apoppin]

Originally posted by: 5150Joker
Wow...just wow. Guess that rules out crossfire for a lot of people

nonsense

with 2 dual-slot GPU coolers exhausting hot air from your case - it's a GREAT way to keep your house warm in winter. :Q
:thumbsup:





and i really doubnt that [practically] it will require much more power than SLi'd and O'Cd 7800gtxes in a nice dual core system

 

[klah]

http://techreport.com/reviews/2005q4/radeon-x1000/index.x?pg=16

We measured total system power consumption

7800GT: 204W
X1800XL: 207W
7800GTX: 225W
X1800XT: 250W
7800GTX SLI: 323W

A X1800XT Crossfire system is going to be closer to 370W based on these figures.

 

[flexy]

Originally posted by: apoppin

Originally posted by: 5150Joker
Wow...just wow. Guess that rules out crossfire for a lot of people

nonsense

with 2 dual-slot GPU coolers exhausting hot air from your case - it's a GREAT way to keep your house warm in winter. :Q
:thumbsup:





and i really doubnt that [practically] it will require much more power than SLi'd and O'Cd 7800gtxes in a nice dual core system

you're not even kidding. With only ONE X850XT and a overclocked A64 system i get SERIOUS heat once i start gaming etc....actually this is SO bad that i think twice whether i want to game especially in summer. (I am not kidding).

Now imagine TWO of them running at max...just whow....

And, yes, putting the PC in some benchmark loop etc. to "heat up the room" is actually a reality - just like a few days ago when it was cold but the heat in the house was not turned on yet

 

[xtknight]

Originally posted by: klah
http://techreport.com/reviews/2005q4/radeon-x1000/index.x?pg=16

We measured total system power consumption

7800GT: 204W
X1800XL: 207W
7800GTX: 225W
X1800XT: 250W
7800GTX SLI: 323W

A X1800XT Crossfire system is going to be closer to 370W based on these figures.

If I remember anything about power supplies, that would equate to 537W of stable power with a 69% efficiency PSU (taking reciprocal of 69% and multiplying that to 370W). Since most PSU's rated at 550W can't provide that much continuously, maybe about 650W at the minimum. However, most power supplies with high ratings tend to have better specs too. On second thought, it really depends how they measured the power. Not sure if that accounts for PSU efficiency or not... perhaps someone else can shed some light on this.

 

[Pabster]

270 watts under full load for a graphics card?

My word. I have entire rigs that don't use that much!

 

[zephyrprime]

Originally posted by: xtknight
If I remember anything about power supplies, that would equate to 537W of stable power with a 69% efficiency PSU (taking reciprocal of 69% and multiplying that to 370W). Since most PSU's rated at 550W can't provide that much continuously, maybe about 650W at the minimum. However, most power supplies with high ratings tend to have better specs too. On second thought, it really depends how they measured the power. Not sure if that accounts for PSU efficiency or not... perhaps someone else can shed some light on this.

It's measured at the wall so it takes account of power supply inefficiency.

Also, I totally don't believe ngohq's contention about how much power the x1800 uses. 270 watts is crazy. They must be confusing total system power draw with card power draw.

 

[Xcobra]

thats it, Crossfire is crossed out from my upgrade list... :disgust:

 

[emilyek]

Originally posted by: orangat
That would mean 1500W if the brand is a Xazer, Aspire, X-connect or someother generic crap.

QFT

 

[rise]

thats ludicrous. there must be some mistake.

 

[aatf510]

Originally posted by: xtknight
If I remember anything about power supplies, that would equate to 537W of stable power with a 69% efficiency PSU (taking reciprocal of 69% and multiplying that to 370W). Since most PSU's rated at 550W can't provide that much continuously, maybe about 650W at the minimum. However, most power supplies with high ratings tend to have better specs too. On second thought, it really depends how they measured the power. Not sure if that accounts for PSU efficiency or not... perhaps someone else can shed some light on this.

This isn't correct.
I 550w PSU with 69% efficiency would be drawing close to 800w from the wall outlet to generate its 550w.

 

[crazydingo]

Originally posted by: klah
http://techreport.com/reviews/2005q4/radeon-x1000/index.x?pg=16

We measured total system power consumption

7800GT: 204W
X1800XL: 207W
7800GTX: 225W
X1800XT: 250W
7800GTX SLI: 323W

A X1800XT Crossfire system is going to be closer to 370W based on these figures.

:thumbsup:

Too bad the thread starter didnt use common sense.

 

[NFS4]

Originally posted by: crazydingo
:thumbsup:

Too bad the thread starter didnt use common sense.

Last time I looked, I didn't write the article I just posted a link to the story as it was in my inbox.

 

[crazydingo]

Originally posted by: NFS4

Originally posted by: crazydingo
:thumbsup:

Too bad the thread starter didnt use common sense.

Last time I looked, I didn't write the article I just posted a link to the story as it was in my inbox.

Do you see me or anybody else posting all the spam they get? Besides the claim is ridiculous and should have set "BS alarm bells" in your head.

 

[mdchesne]

holy moly, pretty soon we're need two PSUs. one for the computer and one for the vid cards!

 

[SynthDude2001]

Maybe buying a 600W Seasonic a few months back wasn't overkill afterall

 

[M0RPH]

Originally posted by: NFS4
http://www.ngohq.com/home.php?page=Articles&go=read&arc_id=49

As you have probably read in the reviews, the new ATI X1000 series require a lot of power. We?ve learned that the X1800XT is a power pig, it can use up to 270w at full load. A typical AMD64 based system requires around 200w in a good case scenario. Two X1800XT cards in Crossfire could demand up to 540w, add this to a normal system power requirement and it could easily reach 740w or more if you use any extra devices.

According to this review it only uses about 10% more power than a 7800gTX under load. So I guess those folks running 2XGTX SLI are needing 700W power supply? These guys are full of it.

 

[Duvie]

Originally posted by: toattett

Originally posted by: xtknight
If I remember anything about power supplies, that would equate to 537W of stable power with a 69% efficiency PSU (taking reciprocal of 69% and multiplying that to 370W). Since most PSU's rated at 550W can't provide that much continuously, maybe about 650W at the minimum. However, most power supplies with high ratings tend to have better specs too. On second thought, it really depends how they measured the power. Not sure if that accounts for PSU efficiency or not... perhaps someone else can shed some light on this.

This isn't correct.
I 550w PSU with 69% efficiency would be drawing close to 800w from the wall outlet to generate its 550w.

Thta is not how they are rated...LOL!!!!

It is a 550watt PSU and it likely is within 5% of that out of the gate...Once temps reach about 40c most of them start reducing the actually power delivery...High end PSU like PC power and cooling and seasonic deliver 80% efficiency at best..Even antecs (a favorite around here does not deliver better then 70% efficiency on most of its lines)


I for one think this person got system power confused with vid card power draw....However it has been called for 480watt power supplies since the late 5x series of nvidia cards....

If I was building an X2 system with sli 7800 gtx's I would be thinking no less then 600watts anyways...but that is me....800 is likely overblown but I imagine 600watts is a good minimum requirement...


As for Crazy Dingo...watch the personal attacks and the thread crapping...Everyone knows NFS is resident "ace reporter" and post stories and does not have tme to check validity of everything...he post we discuss...You would be more inclined to post a rebuttal to actual power usage then make your verbal barbs...This guy is not one you want to start sh^te with...

 

[aatf510]

Originally posted by: Duvie
Thta is not how they are rated...LOL!!!!

It is a 550watt PSU and it likely is within 5% of that out of the gate...Once temps reach about 40c most of them start reducing the actually power delivery...High end PSU like PC power and cooling and seasonic deliver 80% efficiency at best..Even antecs (a favorite around here does not deliver better then 70% efficiency on most of its lines)


I for one think this person got system power confused with vid card power draw....However it has been called for 480watt power supplies since the late 5x series of nvidia cards....

If I was building an X2 system with sli 7800 gtx's I would be thinking no less then 600watts anyways...but that is me....800 is likely overblown but I imagine 600watts is a good minimum requirement...


As for Crazy Dingo...watch the personal attacks and the thread crapping...Everyone knows NFS is resident "ace reporter" and post stories and does not have tme to check validity of everything...he post we discuss...You would be more inclined to post a rebuttal to actual power usage then make your verbal barbs...This guy is not one you want to start sh^te with...

LOL, trust me 600w is seriously overkill for a dual 7800GTX system. People around here love to exagerate power needs.

P.S. In case you haven't notice, modern power supplies are all rated PSU @50C e.g Enermax Antec etc.