Is 750W power supply enough for omen 880-160se with dual 1080 ti?

[xuwd11]

I just ordered a OMEN desktop 880-160se with 2X NVIDIA® GeForce® GTX 1080Ti 11G SLI. The specs are

• 8th Generation Intel® Core™ i7-8700K
• 512 SSD + 2 TB HDD storage
• Black Interior Paint; Side Window; External 3.5" Bay; Liquid Cooling Solution (95w Processor)
• 32 GB memory
• WLAN RT 8822 ac 2x2 +BT 4.2LE WW
• Dual NVIDIA® GeForce® GTX 1080Ti 11G SLI
• 750 W Platinum efficiency power supply

I am concerned about whether 750 W power supply is enough since almost all forums and power supply calculators suggest these specs require at least 850 W power supply. I noticed Dell is providing dual 1080 ti PC (http://www.dell.com/en-us/shop/dell-desktop-computers/new-alienware-area-51/spd/alienware-area51-r5/...) with similar specs (although their price is higher, it is fair since they provide better motherboard, CPU, and memory). And Dell provides the option of 1500 Watt power supply, which would definitely be my choice if I have the option at hp.

I found some explanations on the issue in this post (https://h30434.www3.hp.com/t5/Desktop-Hardware-and-Upgrade-Questions/Required-Power-Supply-HP-Omen/m...). And I consulted customer service; the reply is

"The 750W is the highest power supply option for OMEN Desktop PC - 880-160se. This is sufficient to support your system configuration. This has been tested to work with all the configuration offered for this PC model."

But I am still concerned since there doesn't seem to be enough overclock headroom theoretically.

Has anyone tested OMEN with dual 1080 ti and 750W power supply that they provided (including overclocking)?

Is there a max power supply limit for omen 160se with these specs (z370, i7 8700k, cooling system, and etc.) if I am looking for a higher power supply?

Thanks!

[Big_Dave]

Hi,

Since you quoted using power supply calculators, then what is the efficiency rating of the power supply being used in the calculations?

As food for thought, the NVIDIA GTX 1080 TI (different makes and models) can be provisioned differently for power:

1. One 8 pin power connector
2. One 8 pin and one 6 pin power connector
3. Two 8 pin power connectors

The different power provisioning reflects a different power draw being anticipated by a particular manufacturer.

_________________________________

To my knowledge, HP has never officially sponsored and documented overclocking.

[xuwd11]

Thanks for the information!

1. Unfortunately, the power supply calculator I tried (e.g., https://c1.neweggimages.com/BizIntell/tool/psucalc/index.html?nm_mc=KNC-GoogleKWLess&cm_mmc=KNC-Goog...) doesn't specify the efficiency rating of the power supply.

2. I am actually confused about the actual power delivered when we talk about the efficiency rating of power supply. Does 750W mean the actual continuous power after multiplying the efficiency or the total power before multiplying the efficiency? According to the description in wikipedia (https://en.wikipedia.org/wiki/80_Plus), I guess it is the former (the actual power delivered rather than the total consumption). Is it true (and if it is, why does the efficiency matter when we decide whether the power supply is enough)?

3. As I mentioned, Dell Alienware has a similar model (http://www.dell.com/en-us/shop/dell-desktop-computers/new-alienware-area-51/spd/alienware-area51-r5/...), although the TDP for its CPU (140W) is higher than that for the i7 8700k used in omen (90W). It doesn't even allow you to choose 850W power supply with Gold efficiency when you select 2X 1080 ti; it forces you to choose 1500W power supply. I guess 80 Plus Gold shouldn't differ significantly from 80 Plus Platinum. So it is weird that the max available power supply for omen is 750W (although it is 80 Plus Platinum).

4. I've ordered anyway. I guess I'll figure out whether my concern about the power supply is necessary after I get the machine.

[Big_Dave]

@xuwd11

More food for thought:

HP provisions PCs with one OEM NVIDIA GTX 1080TI and a 500 watt PSU. From what information that I have reviewed, the HP OEM NVIDIA GTX 1080TI only has one 8 pin auxiliary power connector. That power provisioning would for sure limit the the HP OEM NVIDIA GTX 1080TI to 225 watts. So, if you do the math, moving up to a 750 watt platinum rated PSU should be able to support two HP OEM NVIDIA GTX 1080TI graphics cards.

Yikes! I didn't think that all of the calculus courses I took many years ago would be all that helpful for doing the math.:smileywink:

BTW----When running SLI mode you only get x8 lanes per graphics card.

[FattysGoneWild]

I have this pc with the same specs minus a 1080 Ti. Platinum psu or not, I did not feel comfortable with 2 in the system. Especially if you are going to overclock the cpu and gpu's. So, I opted for the single card only and feel very comfortable with that. Even when overclocking the cpu and gpu if need be.