Is this PSU (EVGA 750w BQ) enough to deal with my 3 gpus?

[zorack]

Hey there everyone

Recently I bought a EVGA 750BQ  (https://www.evga.com/products/product.aspx?pn=110-BQ-0750-V1), with the idea of powering 3 gtx 970 g1 gaming which is an specific 970 model that uses 2 power connectors (one 8 pin and one 6 pin) instead of one. When we talk about power, I am totally sure that 750w is enough to feed them, but I am really worried about the power connectors.

The problem is that I just noticed this psu has 3 PCIE cables and 5 molex.  I was planning to connect each gpu 8 pin connector to one of these 3 PCIE cables, and I was planning to use  2 to 6 pin molex adapters to feed the 6 pin gpu connectors. Since the motherboard I bought has one extra molex connection I believe I would be able to solve the gpus power connectors problem, but  is this safe? In this example I would have to power all my riser slots using the infamous SATA to molex adapter that comes with it.

By the way I cannot plug the PSU in the 970s  and test it by myself because the motherboard for this system will probably be delivered where I live only after Christmas.

I really need some help here, because in case I find out that the PSU I bought isnt going to work I need to return it to the seller as soon as possible and buy one that actually works

[zorack]

by the way I just found out these adapters exist:

https://images-na.ssl-images-amazon.com/images/I/81kR2H41fFL._SY355_.jpg

using 2x sata to molex adapterts like this one to power my risers is a much safer option than using that regular 1 sata to molex that comes with it, right? Funny thing I didn't find anyone mentioning these 2x sata adapters on riser adapters discussion threads, and they seem to be really useful

[Undefined31415]

You should be fine powering each graphics card with one cable from the PSU. (Assuming these cables are designed with a 6(+2) PCIe power connector along with a 6 pin or another 6(+2) pin connector.)

Then you will *probably* be fine powering risers with SATA adapters, so long as you ensure that no more than one riser is powered per line of SATA connections out of the PSU.

I personally wouldn't go with EVGA's BQ line of PSUs, since the OEM is usually HEC or Andyson (the former is okay, the latter, not so much).

[ivakar]

Hey there everyone

Recently I bought a EVGA 750BQ  (https://www.evga.com/products/product.aspx?pn=110-BQ-0750-V1), with the idea of powering 3 gtx 970 g1 gaming which is an specific 970 model that uses 2 power connectors (one 8 pin and one 6 pin) instead of one. When we talk about power, I am totally sure that 750w is enough to feed them, but I am really worried about the power connectors.

The problem is that I just noticed this psu has 3 PCIE cables and 5 molex.  I was planning to connect each gpu 8 pin connector to one of these 3 PCIE cables, and I was planning to use  2 to 6 pin molex adapters to feed the 6 pin gpu connectors. Since the motherboard I bought has one extra molex connection I believe I would be able to solve the gpus power connectors problem, but  is this safe? In this example I would have to power all my riser slots using the infamous SATA to molex adapter that comes with it.

By the way I cannot plug the PSU in the 970s  and test it by myself because the motherboard for this system will probably be delivered where I live only after Christmas.

I really need some help here, because in case I find out that the PSU I bought isnt going to work I need to return it to the seller as soon as possible and buy one that actually works

Well, as far as I can see, the power req for gtx970 is about 120-150w - so totals will be 360W - 450W -@ max.
So and you can use 6x pin connectors in 8 pin gpu. just short the last 2 pin or use adapters like this
https://www.amazon.com/StarTech-Express-Power-Adapter-PCIEX68ADAP/dp/B001TK3TJY
or https://www.amazon.com/JacobsParts-6-pin-8-pin-Express-Converter/dp/B00JLTCMFC/ref=pd_lpo_vtph_147_lp_t_3?_encoding=UTF8&psc=1&refRID=XWZCKQE2N8WBWMWTY668

[gregfromo]

I made my biggest fails starting mining with wrong chosen PSU. Don't buy shitty PSU. I consider (today ) shitty PSU:

1. less 1000W
2. less GOLD efficeny
3. not fully modular
4. less 8 pci-e connectors
5. less 7 years warranty

I stick after several tries with different brands now with Corsair HX (1000/1200)

ymmv

[philipma1957]

Hey there everyone

Recently I bought a EVGA 750BQ  (https://www.evga.com/products/product.aspx?pn=110-BQ-0750-V1), with the idea of powering 3 gtx 970 g1 gaming which is an specific 970 model that uses 2 power connectors (one 8 pin and one 6 pin) instead of one. When we talk about power, I am totally sure that 750w is enough to feed them, but I am really worried about the power connectors.

The problem is that I just noticed this psu has 3 PCIE cables and 5 molex.  I was planning to connect each gpu 8 pin connector to one of these 3 PCIE cables, and I was planning to use  2 to 6 pin molex adapters to feed the 6 pin gpu connectors. Since the motherboard I bought has one extra molex connection I believe I would be able to solve the gpus power connectors problem, but  is this safe? In this example I would have to power all my riser slots using the infamous SATA to molex adapter that comes with it.

By the way I cannot plug the PSU in the 970s  and test it by myself because the motherboard for this system will probably be delivered where I live only after Christmas.

I really need some help here, because in case I find out that the PSU I bought isnt going to work I need to return it to the seller as soon as possible and buy one that actually works

return the psu today
go here:

http://www.corsair.com/en-us


use this coupon:

LAST CHANCE SALE! GET 20% OFF WITH COUPON CODE: LASTCALL20

buy this
http://www.corsair.com/en-us/rmi-series-rm1000i-1000-watt-80-plus-gold-certified-fully-modular-psu

199 - 40 = 159 and 10 bucks to ship it 169