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Is this a reasonable assumption: for Kaby Lake builds with one 1080Ti a 650W PSU is sufficient or 850W for SLI?

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57 minutes ago, Djang0 said:

Is this a reasonable assumption: for Kaby Lake builds with one 1080Ti a 650W PSU is sufficient or 850W for SLI?

Yup, it is a reasonable assumption providing you get a decent brand of PSU which will reliably deliver that power.

I have a Kaby Lake powered by a Corsair 650 Watt PSU with a RX480 GPU. Modern GPUs don't need anywhere near the overkill of power old ones used to require, which is why 650 is more than enough. I used to use 850 Watt PSUs for older GPUs, but it just isn't necessary for a modern GPU and CPU, they are vastly more power efficient these days.

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1 hour ago, fwerff said:

I'd go with 850W. Gives you some overhead for future expansions and normal degradation over the lifespan of the PSU.
I have this one: https://www.evga.com/products/product.aspx?pn=220-G3-0850-X1

Wonderful and silent PSU.

+1

If your budget isn't tight then I'd go for the 850. It's there just in case and it'll give you room for more consuming upgrades if you ever decide to. 

Clay

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Another recommendation for EVGA. Great PSUs with high quality components and a 10-year warranty on many of the models.

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7 hours ago, vortex681 said:

Look here for a pretty good indication of what you'll need: https://outervision.com/power-supply-calculator.

Thanks , that's one of the calculators I used toi estimate the wattage. I think they tend to overestimate somewhat.

4 hours ago, fwerff said:

I'd go with 850W. Gives you some overhead for future expansions and normal degradation over the lifespan of the PSU.

The only circumstance that I would consider SLI in the future is if VR headsests directly benefitted.

In my current system i have a corsair TX850, it's about 5yrs old now! Is it worth buying a new PSU if I already have that?

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On 1-12-2017 at 7:16 PM, Djang0 said:

In my current system i have a corsair TX850, it's about 5yrs old now! Is it worth buying a new PSU if I already have that?

I'd think a 5 year old PSU still has some time left, unless you never switched of your pc in that period.

When I bought the components for my new rig -this fall- I choose to renew my PSU because it was 8 years old.

 

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