AMD Radeon R9 295X2 Owners Thread

[bradUK]

chaps,

what I cant work out with two times 295x2 is what wattage does it really pull?

there are massive differences across the reviews from ~1000 right up to ~1400

the sapphire card according to their website pulls 28A on each 8pin so 28Ax2=56Ax12V=672wx2=1344w

but Toms Hardware have just tested this with a fraction under 1000w!

which is right ~1000w or 1344w?

I've noticed massive differences in qouted load and "irl".

I'd be surprised if two cards pulled 1.3kw from the wall?

What interests me is as a sparky is I know what cable CSA's are required for amperage. How these levels can be floating around rigs with barely .75mm cables is astounding.

 

[Mal X]

Ah custom cooled, was thinking that was us9ing the included rad.

the rad with the 295x2 looks too small if you intend to overclock ! you'd need at least a 240mm........... well you deffo do for the 7990

i would just remove the 120 rad from the pipes and try to fit a 240/360, but i think the standard waterblocks that are supplied would be ok

 

[Ploppy2k3]

I've noticed massive differences in qouted load and "irl".

I'd be surprised if two cards pulled 1.3kw from the wall?

What interests me is as a sparky is I know what cable CSA's are required for amperage. How these levels can be floating around rigs with barely .75mm cables is astounding.

when OC3D did the test it was pulling 1.3 at the all and yet Toms Hardware pulled 1kw. I appreciate the other hardware will be different but not that much.

 

[Panos]

There was a post from 8Pack, he did some good research on the subject of 4 290X and the Superflower PSUs.

Ploppy2k3 what is your PSU?

 

[Gerard]

the rad with the 295x2 looks too small if you intend to overclock ! you'd need at least a 240mm........... well you deffo do for the 7990

i would just remove the 120 rad from the pipes and try to fit a 240/360, but i think the standard waterblocks that are supplied would be ok

Wouldn't bother clocking it tbh, the gains are tiny, according to gibbo anything past 1030 can cause performance to go down. 2 of them in stock would do me Wallet says no

 

[Uncle Petey]

the rad with the 295x2 looks too small if you intend to overclock ! you'd need at least a 240mm........... well you deffo do for the 7990

i would just remove the 120 rad from the pipes and try to fit a 240/360, but i think the standard waterblocks that are supplied would be ok

Because it's a hybrid cooler and the water part only has to deal with the cores. Still quite impressive for a 120 though.

Dunno about replacing the rad. It's been done on a couple of clc's, but it's taking a chance.

 

[bemaniac]

You won't hit throttling with the included cooler even after overclocking. I've put the pipes at the bottom now and temps went down 3 more degrees after I left crysis 3 welcome to the jungle running in 4k with 4xMSAA for 3 hours to burn in. Max temp 72 after that which is the most any card will ever have in terms of loading. It's 6.75gb of vram used and 28-32fps at 100% on each core.

In other news I've ordered ocuks new silverstone high pressure fans so they're going on it tuesday. So is the lindy damn expensive mini dp to dp cable that arrives tuesday.

You know with a 290X added in I'd probably be running crysis 3 in 4k very high at 60fps.

 

[Panos]

In other news I've ordered ocuks new silverstone high pressure fans so they're going on it tuesday.

Are there any Silverstone high pressure fans? Because last time I checked the best they could do was 1.82mm H2O/67 CFM flow.

In comparison the Piranhas are 3.04mm H2O/79 FCM with only 3db more noise.
Which can set to 80% fan speed as I have, and are not more loud than the stock fan which is very quiet to be honest.

 

[Loxa]

You won't hit throttling with the included cooler even after overclocking. I've put the pipes at the bottom now and temps went down 3 more degrees after I left crysis 3 welcome to the jungle running in 4k with 4xMSAA for 3 hours to burn in. Max temp 72 after that which is the most any card will ever have in terms of loading. It's 6.75gb of vram used and 28-32fps at 100% on each core.

In other news I've ordered ocuks new silverstone high pressure fans so they're going on it tuesday. So is the lindy damn expensive mini dp to dp cable that arrives tuesday.

You know with a 290X added in I'd probably be running crysis 3 in 4k very high at 60fps.

I changed the pipes location today and if anything I gained a 3c increase.

 

[Joe Nose]

In comparison the Piranhas are 3.04mm H2O/79 FCM with only 3db more noise.
Which can set to 80% fan speed as I have, and are not more loud than the stock fan which is very quiet to be honest.

Finding mine is on the edge of throttling with the stock profile under sustained load, any significant o/c pushes it to 74 deg+ - that's with the rad rear mounted with pipes pointing down.

So I'll follow your advice I think and grab a pair of Piranhas. Can a Y-splitter cable be used to connect both fans to the card, or are you connecting one / both to the mobo?

 

[Panos]

Finding mine is on the edge of throttling with the stock profile under sustained load, any significant o/c pushes it to 74 deg+ - that's with the rad rear mounted with pipes pointing down.

So I'll follow your advice I think and grab a pair of Piranhas. Can a Y-splitter cable be used to connect both fans to the card, or are you connecting one / both to the mobo?

Personally I will connect both to the motherboard.

By the way, get MSI AB set the card to the lowest mV until is stable (NEGATIVE NUMBER), while at the same time put power limit 50%.

Mine runs cool at -60mV/50% limit at speeds 1090/1625. And even while on Valley it will not hit more than 65C with the stock fan.

bemaniac managed to go all way down to -100mV with 1030/1625 overclock and runs Crysis all day along.

 

[Ploppy2k3]

There was a post from 8Pack, he did some good research on the subject of 4 290X and the Superflower PSUs.

Ploppy2k3 what is your PSU?

superflower 1200w

 

[Panos]

superflower 1200w

No problem then

Use the MSI AB to lower the mV as much as they can take, raise the powelimit to 50%, and you are fine.

 

[Ploppy2k3]

No problem then

Use the MSI AB to lower the mV as much as they can take, raise the powelimit to 50%, and you are fine.

i will give it a go. my other PSU is an HX1000 so

its a shame as I've had that PSU for years and its been 100% but given the issues people are having with it I had to opt for the superflower (stupid name!)

 

[Uncle Petey]

You have room for dual psu's in the 900D, right?

 

[GoogalyMoogaly]

You have room for dual psu's in the 900D, right?

Not with 2 x 480 rads you don't (if they're both internal).

 

[Ploppy2k3]

Not with 2 x 480 rads you don't (if they're both internal).

there aint no room!

damn should have bought that Caselabs........

 

[Panos]

i will give it a go. my other PSU is an HX1000 so

its a shame as I've had that PSU for years and its been 100% but given the issues people are having with it I had to opt for the superflower (stupid name!)

The problem with the HX1000 is because is multirail not single rail
My 700 Corsair could have hold the 295X2 just fine, if it wasn't multirail one.

 

[Uncle Petey]

Ploppy (lol), would it help if I ran a few benches and measured the wattage using my three cards at stock and OC'd cpu?
You can just estimate the extra usage of an additional card.

Any particular bench/game?

Or could just ask Kaap, I guess.

 

[VincentHanna]

My fans haven't arrived yet, and DPD haven't given a delivery time which is very unlike them.

I was playing Crysis 2 at 1440p, DX11 Ultra mode with Afterburner running and GPU 2 was throttling down to 750Mhz.

That's pretty bad. GPU 1 rock solid still.

I might reduce the mV power as was suggested.