GTX 1080 & GTX 970 In Same PC with 750w psu

[StrixxTV]

I just got a 1080 not to long ago and I put a gtx 970 in there to so that I could use the 970 for recording, because I record with nvenc, I was wondering if a 750w psu will be good enough for those two cards. the 970 doesn't do anything except help with physx and record. please help

[79wjd]

750w is MORE than enough. You could add another 1080 on top of that and still have headroom. 

[Brooksie359]

3 minutes ago, djdwosk97 said:

750w is MORE than enough. You could add another 1080 on top of that and still have headroom. 

I mean it kinda depends what else is in the system tbh. I mean for sure one 1080 would be fine but 2 of them plus a 970 is a bit of an exaggeration. I mean you would at least need to know the cpu and what is being overclocked.

[rip]

2 minutes ago, Brooksie359 said:

I mean it kinda depends what else is in the system tbh. I mean for sure one 1080 would be fine but 2 of them plus a 970 is a bit of an exaggeration. I mean you would at least need to know the cpu and what is being overclocked.

http://www.techspot.com/review/1195-palit-geforce-gtx-1080-sli/

[Energycore]

13 minutes ago, rip said:

 

http://www.techspot.com/review/1195-palit-geforce-gtx-1080-sli/

You know 750W is enough when even 2 390Xs only pull 600W

[faziten]

On 5/6/2017 at 1:22 AM, StrixxTV said:

I just got a 1080 not to long ago and I put a gtx 970 in there to so that I could use the 970 for recording, because I record with nvenc, I was wondering if a 750w psu will be good enough for those two cards. the 970 doesn't do anything except help with physx and record. please help

Well i guess you already know it's overkill as fuck

But you also should know if you plan to realtime-encode (with GeForce Experience screen recorder) you won't be able to use your 970 to offload such thing. The way it works is by dumping the framebuffer, so if you are using the 1080 the 970 will have it's framebuffer empty. 

 

Also remember 970 has NO HEVC encoder. so you are stuck with H264 codec. (it only has partial HEVC decode, so forget about encoding HEVC with 970). 

 

As i see there are very little scenarios where you would be able to actually use the 970 as intended, and in all those scenarios the 1080 is better, so i can't really justify it. 

Cheers!

[StrixxTV]

12 hours ago, faziten said:

Well i guess you already know it's overkill as fuck

But you also should know if you plan to realtime-encode (with GeForce Experience screen recorder) you won't be able to use your 970 to offload such thing. The way it works is by dumping the framebuffer, so if you are using the 1080 the 970 will have it's framebuffer empty. 

 

Also remember 970 has NO HEVC encoder. so you are stuck with H264 codec. (it only has partial HEVC decode, so forget about encoding HEVC with 970). 

 

As i see there are very little scenarios where you would be able to actually use the 970 as intended, and in all those scenarios the 1080 is better, so i can't really justify it. 

Cheers!

When I said recording I ment streaming or recording with obs which is something I use often, and bandicam. I should have worded that better. Thanks 

[faziten]

6 hours ago, StrixxTV said:

When I said recording I ment streaming or recording with obs which is something I use often, and bandicam. I should have worded that better. Thanks 

The issue stands. Let's say you are gaming using your 1080. You want to record your gameplay and you want to use your 970 to encode it using NVENC. 

 

You won't. Simple as that. 

Remember that recorders hook the framebuffer to "record". If you use your 1080 to game the 970 will be idling with its framebuffer empty. 

 

Furthermore: if you try to encode AFTER you are done with the recording tasks (which is risky since a crash will trash your recording). You still should use the 1080, since it's H265 will give you better results at same bitrate, i'd sell the 970 and buy a video capture card. That completely offloads the encoding part without ANY impact on your rig whatsoever. (Less power draw, less noise, less heat.) Just a thought. 

 

regarding your question of will your PSU suffice?. YES!

remember using the NVENC just pulls energy from the video engine ASIC inside the GPU which at most uses 20% of the card power delivery capabilities. (In short: recording/encoding or transcoding puts little stress on the GPU it wont use it's full power design like gaming or such things.).