PSU 750W... Which of mine is "better"?

[Plappy]

Hey guys,

I have two PSU's available for my build, am wondering which would be more efficient and "better". One is 80+ platinum and the other bronze, but the platinum one is not a reputable manufacturer and was a PSU that was from a pre-made rig. Is the platinum one still better to use?

My specs are as follows:
Intel I7 9700k
RTX 2080 Ti
64 GB DDR4 RAM

The 80+ Bronze is a Corsair CX750M
The 80+ Platinum is Delta Electronics DPS-750AB-40A
Pics of both models:

 

 

[seon123]

4 minutes ago, Plappy said:

but the platinum one is not a reputable manufacturer

What have you been smoking? Whatever it is, it must be some strong stuff. Delta is a large and very reputable PSU OEM. Use that one, assuming it has all standard connectors.

[Plappy]

sorry, not too familiar with all the big names in PSU manufacturing... I only really know the ones that market heavily like corsair EVGA etc.

 

Good to know HP isnt slapping crap PSU's into their prebuilt systems... the motherboard the system came with was absolute crap

[SupaKomputa]

The HP one is slightly better with 90A total 12v rails.

[seon123]

1 hour ago, SupaKomputa said:

The HP one is slightly better with 90A total 12v rails.

That's not how it works at all. If you have no idea what you're talking about, please have the courtesy to at least not share absolute bs.

 

45A on each 12V rail means that you can pull up to 540W (12V * 45A) from either rail without triggering OCP. But you can also not pull more than 750W (62.5A) combined from the PSU without triggering OPP.

 

Also, looking at how many amps the 12V rail(s) are rated for is not how to decide if one PSU is better than another.

Edited August 18, 2020 by seon123
Something something

[tkitch]

The biggest concern:  OEM PSU's are frequently not wired to ATX Spec.  

And will fry motherboards.  Don't rely on it being correct for a normal board, unless you've verified.

[Ankerson]

Personally I wouldn't hook up either one to that RTX 2080Ti if it was mine. Leave the GPU in the box until you get a good PSU.

 

Try and find something better that's in stock etc. And don't buy a used one....

 

Something from the Tier A in the list.

 

I was able to find a Corsair HX 750 Platinum (backordered it, not in a hurry) at New Egg for the original price, they have the HX 850 in stock currently, also original pricing...

 

They have the Corsair RMX 750 in stock NOW... For reasonable price....

 

 

[Plappy]

14 hours ago, Ankerson said:

Personally I wouldn't hook up either one to that RTX 2080Ti if it was mine. Leave the GPU in the box until you get a good PSU.

 

Try and find something better that's in stock etc. And don't buy a used one....

 

Something from the Tier A in the list.

 

I was able to find a Corsair HX 750 Platinum (backordered it, not in a hurry) at New Egg for the original price, they have the HX 850 in stock currently, also original pricing...

 

They have the Corsair RMX 750 in stock NOW... For reasonable price....

 

 

any reason? are my PSU's bad?

[Deli]

7 minutes ago, Plappy said:

any reason? are my PSU's bad?

You can afford an 2080Ti. Don't cheap out on PSU.

[quan289]

Generally speaking, PSUs used by system builders like Dell, HP, etc. are decent. They are built to power a system it's design to reliably and fully. If you have a Dell office PC with a 305w PSU from Hipro / Chicony, then it will likely capable of supplying that 305w within ATX specs which is better than some of the enthusiast brands: that not only fail to do what they are rated for, they go out of specs for when they are working (Cooler Master Elite / v2 and Thermaltake Purepower / TR2 RX for example).

 

Delta is a top tier OEM, and if this didn't change in the last few years I've been out of touch with tech news, they are the largest as well. In fact, they are the manufacturers of some "Tier A / 1" Antec PSUs on that tier list. Of course, I'm not saying you should expect the same for your particular unit, but rather, if HP decided to used Delta PSUs for a high-performance gaming rig (which I believe this particular model or its revision are found in their HP Omen Obelisk line-up that are configurable to have an i7-9900k+2080Ti) and I have that PSU on hand, there's a good chance that I would used it in my rig - provided that uses a standardized connectors.

[Ankerson]

9 hours ago, Plappy said:

any reason? are my PSU's bad?

 

Neither one is worth the risk to your system with the parts you have...

 

On the HP, it's not correct for your system, I wouldn't even try and plug it in.

 

That's really only 540W on the 12V.... Both say 45A, and you don't total them up... Don't even think about it even in your wildest dreams.

 

The Corsair CXM is not made for your system, more of a mid to lower range machine...

 

To make it short and to the point....

 

GET A NEW QUALITY PSU...

 

 

[Ankerson]

8 hours ago, quan289 said:

Generally speaking, PSUs used by system builders like Dell, HP, etc. are decent. They are built to power a system it's design to reliably and fully. If you have a Dell office PC with a 305w PSU from Hipro / Chicony, then it will likely capable of supplying that 305w within ATX specs which is better than some of the enthusiast brands: that not only fail to do what they are rated for, they go out of specs for when they are working (Cooler Master Elite / v2 and Thermaltake Purepower / TR2 RX for example).

 

Delta is a top tier OEM, and if this didn't change in the last few years I've been out of touch with tech news, they are the largest as well. In fact, they are the manufacturers of some "Tier A / 1" Antec PSUs on that tier list. Of course, I'm not saying you should expect the same for your particular unit, but rather, if HP decided to used Delta PSUs for a high-performance gaming rig (which I believe this particular model or its revision are found in their HP Omen Obelisk line-up that are configurable to have an i7-9900k+2080Ti) and I have that PSU on hand, there's a good chance that I would used it in my rig - provided that uses a standardized connectors.

 

You would blow the PSU with that system.....

 

That one is really only 540W on the 12V+...

 

Would be like trying to run a 9900K and 2080Ti on a 550W PSU.....

[Spotty]

2 minutes ago, Ankerson said:

 

You would blow the PSU with that system.....

 

That one is really only 540W on the 12V+...

The Dell PSU shown in the OP has two 12V rails, each rated for a max of 45A (540W). The total output is rated at 750W.

 

See:

On 8/18/2020 at 10:51 AM, seon123 said:

45A on each 12V rail means that you can pull up to 540W (12V * 45A) from either rail without triggering OCP. But you can also not pull more than 750W (62.5A) combined from the PSU without triggering OPP.

[GoldenLag]

6 minutes ago, Ankerson said:

Would be like trying to run a 9900K and 2080Ti on a 550W PSU.....

other than it actually being a 750w PSU. 

 

you can run that setup on a 550w PSU. 

 

On 8/18/2020 at 2:08 AM, Plappy said:

The 80+ Bronze is a Corsair CX750M
The 80+ Platinum is Delta Electronics DPS-750AB-40A

either is fine for the usage. 

 

could you take pictures through the grill of the OEM PSU? would help in identifying the units topology etc. tho its likely the better unit of the two options. assuming it has the connectors required. 

[Ankerson]

8 minutes ago, Spotty said:

The Dell PSU shown in the OP has two 12V rails, each rated for a max of 45A (540W). The total output is rated at 750W.

 

See:

NO, look at the other rail outputs.... Too much on the the 5V+ and 3V+ rails.

 

540 + 130 = 670W + the - rails....

[seon123]

3 minutes ago, Ankerson said:

NO, look at the other rail outputs.... Too much on the the 5V+ and 3V+ rails.

 

540 + 130 = 690W +

You might want to look at the label again. And what has been explained to you. And the basic arithmetics that you just failed at

[Ankerson]

3 minutes ago, seon123 said:

You might want to look at the label again. And what has been explained to you. And the basic arithmetics that you just failed at

 

Already fixed before you posted.... 

 

You can't pull 45A on both 12V+ rails at the same time... plus the 130W on the 3V and 5V....

 

That's not a 1210W PSU....

[Spotty]

2 minutes ago, Ankerson said:

NO, look at the other rail outputs.... Too much on the the 5V+ and 3V+ rails.

 

540 + 130 = 690W +

540 + 130 = 670

 

And that's not how that works. Unless you are suggesting your Seasonic Prime Ultra Titanium 750W is really only a 600W PSU since it's rated for max 100W on 3.3V and 5V combined.

[seon123]

5 minutes ago, Ankerson said:

 

Already fixed before you posted.... 

 

You can't pull 45A on both 12V+ rails at the same time... plus the 130W on the 3V and 5V....

 

That's not a 1210W PSU....

I recommend rereading what I wrote. For I think the third time now?

On 8/18/2020 at 2:51 AM, seon123 said:

45A on each 12V rail means that you can pull up to 540W (12V * 45A) from either rail without triggering OCP. But you can also not pull more than 750W (62.5A) combined from the PSU without triggering OPP.

 

[Ankerson]

3 minutes ago, Spotty said:

540 + 130 = 670

 

And that's not how that works. Unless you are suggesting your Seasonic Prime Ultra Titanium 750W is really only a 600W PSU since it's rated for max 100W on 3.3V and 5V combined.

 

That's right 62x12=744W

 

Not quite the same as 540W on BOTH 12V+ on the HP that totals to 1180W.

[Ankerson]

3 minutes ago, seon123 said:

I recommend rereading what I wrote. For I think the third time now?

 

 

NOWERE does it say 62A anywhere on that PSU....

 

I can read numbers....

 

You can't assume anything.....

[GoldenLag]

1 minute ago, Ankerson said:

 

NOWERE does it say 62A anywhere on that PSU....

indeed that is true, doesnt change what the PSU can output. as OPP doesnt check for current, it checks for wattage. 

 

the OEM unit can draw 45a from either rail with a total sustained output of 750w. 

[Spotty]

7 minutes ago, Ankerson said:

That's right 62x12=744W

 

Not quite the same as 540W on BOTH 12V+ on the HP that totals to 1180W.

Each of the two 12V rails individually can do a maximum of 540W (45A at 12V), however the power supply can only output a maximum total of 750W.

 

Think of it as having a fire hydrant with two attachments for hoses. The fire hydrant can do 750 litres of water a minute. Each hose can carry a maximum of 540 litres of water a minute. If you have one hose plugged in to the fire hydrant, you can do up to 540 litres of water per minute from that hose. If you have two hoses plugged in to the fire hydrant, then combined the two hoses can only do a total of 750 litres per minute because that's the limitation of the hydrant.

 

 

This is why manufacturers stopped making multi-rail PSUs.

[Ankerson]

1 minute ago, GoldenLag said:

indeed that is true, doesnt change what the PSU can output. as OPP doesnt check for current, it checks for wattage. 

 

the OEM unit can draw 45a from either rail with a total sustained output of 750w. 

 

Yes, that is correct....

 

Going by what it says, that it is a 750W total output....

 

 

[Ankerson]

5 minutes ago, Spotty said:

Each of the two 12V rails individually can do a maximum of 540W (45A at 12V), however the power supply can only output a maximum total of 750W.

 

Think of it as having a fire hydrant with two attachments for hoses. The fire hydrant can do 750 litres of water a minute. Each hoses can carry a maximum of 540 litres of water a minute. If you have one hose plugged in to the fire hydrant, you can do up to 540 litres of water per minute from that hose. If you have two hoses plugged in to the fire hydrant, then combined the two hoses can only do a total of 750 litres per minute because that's the limitation of the hydrant.

 

 

This is why manufacturers stopped making multi-rail PSUs.

 

 

I know that and that was the reason. 

 

Also why I never really liked them, but that was what we all had to use back then....

 

The newer ones do it all internally, Jonny could explain that one better like on the Corsair HX series that has the switch on it.