850W PSU enough for an 3090 + 1070 GPUS ?

[em_lab]

Hi i would like to know if an 850w corsair PSU could handle 

one rtx3090 + one gtx1070 + Ryzen 5950x + 1 sata hdd + 3ssd nvme ?

 

i planing to buy this rtx 3090 and i´m worry about the psu 

and i would like to have both gpus in the same pc

 

thanks for your advice

[JKRsega]

I wouldn't risk it myself. At least 1200w to cover transient spikes (big jumps in power demands). This is a guesstimate though.

[LTTFan16538228]

With your config, it seems your 850W PSU is plenty. But why do you want the GTX 1070 in the PC? 

[Alex Atkin UK]

7 minutes ago, LTTFan16538228 said:

With your config, it seems your 850W PSU is plenty. But why do you want the GTX 1070 in the PC? 

Disagree, you're not taking into account transients.  Fairly sure I've seen some people with a 3080 alone causing an 850W to power off/reboot.

[ColdFusion04]

Ryzen 9 5950x = 105W

RTX 3090 = 350W, up to 535W peak (from techspot.com)

GTX 1070 = 145W, up to 352W peak (from techspot.com)

SATA HDD = up to 16W

3 SSD NVMe = up to 12W (PCIE4)

 

So imho 850W can become a fairly tight fit, under full load from all components your system would draw 628W (1020W peak).

If you remove the GTX 1070, 850W is enough.

[em_lab]

thanks a lot for your explainatios

very clarifying 

 

[em_lab]

17 minutes ago, LTTFan16538228 said:

With your config, it seems your 850W PSU is plenty. But why do you want the GTX 1070 in the PC? 

because it helps to have multi gpus rendering or decharge the 3090 while you can use the 1070 for others soft and keep the 3090 only form 3d rendering

[Alex Atkin UK]

10 hours ago, em_lab said:

because it helps to have multi gpus rendering or decharge the 3090 while you can use the 1070 for others soft and keep the 3090 only form 3d rendering

Helps in what way?  Having an extra GPU adds a decent amount of extra idle power consumption.