Can i crossfire the Sapphire 280x Toxic using Seasonic X 750w gold

[omagi55]

As the title says.. Can i crossfire the Sapphire 280x Toxic using my Seasonic 750w 80+ gold? I'm not planning on overclocking it. I'll run it on stock. I already bought one 280x Toxic and I'm going to buy another one if my PSU can support it.


Thank you!

 

[thasan1]

750 should be enough

 

[jitpublisher]

Yes.

 

[omagi55]

Thanks guys!

 

[Squishy Tia]

As this card can draw very near its maximum power (375 watts) when running above stock and above 300 watts at stock, you may well run into shutdowns with a 750 watt power supply. I would recommend an 850 watt PSU at a minimum since other components need power too, including the CPU, which is going to clock in at a minimum TDP of 85W on a Haswell system. That leaves you 65 watts of headroom on an 850 watt continuous RMS PSU.

I strongly recommend a 1000W PSU if you intend to overclock any part of the system at all.

Edit: Here is the power, temperature, and noise section of Anandtech's review. While the power tests show total system power, they're not using a fully loaded system either. You can expect to hit thermal and capacitance limits with a 750W PSU if you run two of these in CrossFire mode, especially with a motherboard that uses a PLX PEX 8747 chip onboard such as the Gigabyte OC Force or Gigabyte G1.Sniper G5.

 

[thasan1]

nah. i think 750W is just enough. anandtech used a monster CPU with a TDP of about 130W and he probably has a 4670K which has a TDP of about 90W. so if anand techs build uses about 340W he build will probably use 300W, and if he add's another R9-280X with a TDP of 300W he's total power consumption would be 600W, he still has a nice 150W headroom.

 

[Squishy Tia]

The other R9 280X cards have a TDP approaching 300W, but the Toxic reaches closer to the 375W it's specifically hardwired for. While it's impractical to think the card will run at 100% load 100% of the time, it leaves much less headroom than you think. It's specifically designed with two 8-pin PCIe connectors for a reason (375W total draw capability for the card itself). Assuming a conservative 320W per card, that comes to 640W total just for the two Toxic cards, leaving 110W for the rest of the system under load. 90W is taken by the CPU, not accounting for any system overclock, leaving 20W for the components.

He should be using an 850W PSU minimum with two Toxic cards if he doesn't want to stress the components and shorten their lifespan. 1000W would be ideal, especially if he intends any serious overclocking.

 

[thasan1]

well, at metro LL a single card+ CPU consumes 340W so during gaming scenario's power consumption shouldn't be over 250W per card. if he is video editing or something, or maybe even going with triple monitor then i too think 850W is a better option.