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Trifire power requirement

1K views 40 replies 9 participants last post by  TwoCables 
#1 ·
I currently have a R9 295x2 with a 1000w PSU and intel i7-4790k I was wondering if anyone knows if I could put a R9 290x in and do trifire, but I'm not sure if I have a big enough PSU
 
#4 ·
As a rule I start at 500 watts and then add 200 watts for each extra card I put in. That's just my personal thing, but I think it's a good rule of thumb.
 
#5 ·
I just fired up BF4 at stock GPU clocks and I am pulling just shy of 1100 Watts at the wall.....CPU is overclocked to 4.4GHZ @1.385V

Hard to see, crappy phone pic, but it says 1096 watts, so not sure what your processor pulls versus mine, but I am thinking you are gonna be really, really close..close enough where I would want a larger PSU maybe.
imagea4aa5.jpg
 
#7 ·
Quote:
Originally Posted by TwoCables View Post

If the 4930K has a similar power consumption to the 3930K, then it's pulling a lot more than the 4790K (which is just a mainstream CPU as well).
\

4930k way less power than a 3930k, 22nm vs 32nm



here is his processor, so not that much different, he would still be pushing really really close if not over 1000watts, i think.

average-power.png
 
#9 ·
So you think he is cool to just roll the dice and pray he never exceeds that 10 watt headroom? His Power supply is 1000 watts remember
biggrin.gif


I think he would be wise to get a bigger power supply or just stick with 2 cards, but then again maybe the 295x2 draws less power than 2 290x's.

Either way I know I have 200 or so watts to spare, and I still don't feel comfortable, with only a 1200 watt Power supply. Maybe he would?

Edit- it looks like the 295x2 uses about 50 watts less than two 290x's under load. So he bought himself another 50 watts..plus he prolly has 50-100 watts less with his processor maybe. So he would probably pull close to 1000 watts at the wall, still dang close really.
 
#11 ·
Sigh...
facepalm.jpg
You guys aren't listening. I'm sorry, but you're not!

Quote:
Originally Posted by the9quad View Post

So you think he is cool to just roll the dice and pray he never exceeds that 10 watt headroom? His Power supply is 1000 watts remember
biggrin.gif
Again, he has a very high-end PSU that can deliver 1000W to his computer 24/7 if it's ever required. What, do you think that pulling 1001W would hurt his PSU? This thing isn't a toy, you know. It's also not peak-rated, it's CONTINUOUS-rated.

Quote:
Originally Posted by the9quad View Post

I think he would be wise to get a bigger power supply or just stick with 2 cards, but then again maybe the 295x2 draws less power than 2 290x's.
And I think that he would be wise to test it and to also use a wall meter to see what his power consumption is while gaming. Why should he spend that much money on a new PSU in addition to the R9 290X before finding out if he even needs to?! A wall meter is only about $20!

Quote:
Originally Posted by the9quad View Post

Either way I know I have 200 or so watts to spare, and I still don't feel comfortable, with only a 1200 watt Power supply.
You have a continuous-rated PSU.

Quote:
Originally Posted by the9quad View Post

Maybe he would?
Dude, I'm still waiting for him to answer my questions that I posted in Post #2! Let's relax a little bit while we wait? Y'know? Let's not jump to conclusions?

Quote:
Originally Posted by the9quad View Post

Edit- it looks like the 295x2 uses about 50 watts less than two 290x's under load. So he bought himself another 50 watts..plus he prolly has 50-100 watts less with his processor maybe. So he would probably pull close to 1000 watts at the wall, still dang close really.
Do you realize that 1000W at the wall with 90% PSU efficiency is 900W? For his PSU, delivering 900W out of the 1000W continuous capacity that it has is pretty easy.
 
#12 ·
Quote:
Originally Posted by TwoCables View Post

Sigh...
facepalm.jpg
You guys aren't listening. I'm sorry, but you're not!

Again, he has a very high-end PSU that can deliver 1000W to his computer 24/7 if it's ever required. What, do you think that pulling 1001W would hurt his PSU? This thing isn't a toy, you know. It's also not peak-rated, it's CONTINUOUS-rated.

And I think that he would be wise to test it and to also use a wall meter to see what his power consumption is while gaming. Why should he spend that much money on a new PSU in addition to the R9 290X before finding out if he even needs to?! A wall meter is only about $20!

You have a continuous-rated PSU.

Dude, I'm still waiting for him to answer my questions that I posted in Post #2! Let's relax a little bit while we wait? Y'know? Let's not jump to conclusions?

Do you realize that 1000W at the wall with 90% PSU efficiency is 900W? For his PSU, delivering 900W out of the 1000W continuous capacity that it has is pretty easy.
He will be so close to maximum or over that it will be a problem in the long run. The power draw is going to fluctuate and if hes pulling around 1kw it may spike up and or increase with temps. He didn't mentioned if he intends to overclock them as he won't be able to. He could just overclock his 295x2 to get better performance while it wont match trifire in a game that supports good scaling. I honestly couldn't recommend him doing trifire on 1kw psu myself, as many others here have posted who do have the hardware.
 
#13 ·
Quote:
Originally Posted by DividebyZERO View Post

He will be so close to maximum or over that it will be a problem in the long run. The power draw is going to fluctuate and if hes pulling around 1kw it may spike up and or increase with temps. He didn't mentioned if he intends to overclock them as he won't be able to. He could just overclock his 295x2 to get better performance while it wont match trifire in a game that supports good scaling. I honestly couldn't recommend him doing trifire on 1kw psu myself, as many others here have posted who do have the hardware.
Dude, he has only made one post, and that's the original post! I'm still waiting for him to reply to my first post in this thread. So, I'm not going to jump to any conclusions until I can do a Q&A with him. So, his reason for not mentioning overclocking yet is he hasn't been back to OCN yet.

So at this point, I only care what his answers will end up being. Everything else is just speculation. We don't even know if he's overclocking his CPU. Hell, we don't even know what games he plays or even how often he PLAYS those games.
 
#16 ·
Quote:
Originally Posted by TooManyAlpacas View Post

Sorry for taking so long to reply but my cpu is not overclocked and I currently have my r9 295x2 overclocked but if I get another card I will not OC any of them
Do you plan to overclock the CPU? Ever?

Quote:
Originally Posted by PontiacGTX View Post

with 16 pcie lanes is not a good idea
Why?

I'm not challenging, I just honestly don't know why.
 
#17 ·
Quote:
Originally Posted by PontiacGTX View Post

with 16 pcie lanes is not a good idea
Why not?
295X2 = 8 lanes + onboard PLX PCIE lane doubler would equal 8 lanes per gpu core
290X = 8 lanes

On top of that, were dealing with PCIE 3.0 which a 4x lane would be more than enough for a 290X.
 
#20 ·
Quote:
Originally Posted by DR4G00N View Post

Quote:
Originally Posted by PontiacGTX View Post

with 16 pcie lanes is not a good idea
Why not?
295X2 = 8 lanes + onboard PLX PCIE lane doubler would equal 8 lanes per gpu core
290X = 8 lanes

On top of that, were dealing with PCIE 3.0 which a 4x lane would be more than enough for a 290X.
lol, it's not a lane doubler. It's not magic ppl. The PLX is a multiplexer, it's like a crossing guard directing traffic. All that traffic still has to go thru the original x16 lanes on the cpu die.
 
#22 ·
I love forums...Telling someone that "hey your psu is 1000watts and you're gonna prolly pull close to 1100 at the wall so you might want a bigger psu" in any other universe would be a sensible reply. Here it's fighting words...internets!

FYI two cables don't assume people are stupid and talk down to them. There was a reason I said watts at the wall, because I am not an idiot. So chill. people are allowed to have a differing opinion without it being an argument.

I understood your point before you even made it, which is why I originally said what my power was with watts at the wall. Btw I think I understand efficiency I teach stuff a tad more complicated than a computer power supply.
 
#23 ·
Quote:
Originally Posted by the9quad View Post

I love forums...Telling someone that "hey your psu is 1000watts and your gonna prolly pull close to 1100 at the wall so you might want a bigger psu" in any other universe would be a sensible reply. Here it's fighting words...internets!
Sigh. Would you drop that attitude already? Good lord, dude. I am waiting for him to tell me if he will ever overclock his CPU. Did you see that? He doesn't have his CPU overclocked right now, so the logical response is to ask if he will ever overclock it. Did you also see that he will NOT overclock his 295x2 anymore once he puts the 290X in?

So, relax!! I'm not going to ask him to spend a ton of extra money IN ADDITION TO WHAT HE WILL SPEND ON THE 290X before we even know if his super high-end 1000W PSU will be enough! So far, I'd say that it will be plenty. However, I am asking questions in order to FIND OUT. That's what you should be doing too, if you really wanted to help. Sigh.

Maybe you should just back off and watch me work. You will see that I'm not as stupid as you think I am. I ask questions in order to arrive at my conclusions. You seem to prefer jumping to conclusions BASED ON YOUR OWN RIG AND YOUR OWN USAGE SCENARIOS. That's a bad way to help people. It's inconsiderate of their individual needs.
 
#24 ·
No I had a different opinion than you, and your the internet guy who is always right. It is cool bruh, you're that guy. Every forum has one and they immediately go to acting like no one is smart enough to understand their point and if only you morons could see, you'd see you're right. No shame in that, own it dog! Use moar caps, btw it drives your point home.
 
#26 ·
Well next time talk to people like an adult instead of acting like "dude! Do you even understand efficiency? You're opinions wrong stand back and let me do my work!" Treat people how you'd like to be treated.

I took the time to fire up my rig to give him some real world numbers of a general range he can expect to draw from the wall, and told him he'd be close.That's a tad more than anyone else gave him.

Power supply efficiency goes down as you get closer to their maximum ratings and running them for long periods close to their maximum output can degrade them. Just a little FYI. There is a reason they say continuous power supplies can run a long time at max voltage, but don't really define that length of time.
 
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