A question about adapters

[Rafael.luc]

Yeah.


I'll need to use a 24-pin to 18-pin adapter to connect the power supply to the motherboard to do so.

The power supply in the Z230 workstation is 400W with an 18-pin connector for the motherboard and a 6-pin connector for the graphics card. I believe it will work well with the RX 570, but I'm wondering which option is better: getting a 6-pin to 8-pin adapter and running the RX 570 on the original power supply, or installing the EVGA power supply, which would require me to get an 18-pin to 24-pin adapter to connect it to the motherboard.

You can take a picture of your 6P cable, it has a writing/code printed on the cable.

 

[Shrek]

I say the current PSU with an adapter for the graphics card. The reason for this is that that specific EVGA PSU is bottom tier stuff, and that the PSU for the workstation is likely* of higher quality. It'll be fine, the RX570 isn't a power monster and as long as you don't have like dozen+ hard drives or something connected to it it will be just fine for the RX570.

*I say "likely"because Delta Electronics makes some high end stuff, but they also manufacture stuff to whatever specifications their customers are giving them so there's no way of knowing how good that specific power supply is without looking at the components inside and test it properly. Add to this that it's about ten years old at this point.

I agree, that EVGA supply can have issues
EVGA 500W Review - Another One (PSU) Bites the Dust (youtube.com)

 

[Rafael.luc]

I agree, that EVGA supply can have issues
EVGA 500W Review - Another One (PSU) Bites the Dust (youtube.com)

EVGA is good for the price, you can find better PSU in the same category (Bronze)

Test 700W is hot, 600B is not Bronze as they say

Corsair CX only Ripple could be better at full load, but it's OK

 

[Toothless]

I used a 6 to 8 pin on more power hungry cards. It'll be fine.

 

[Octavious]

I say the current PSU with an adapter for the graphics card. The reason for this is that that specific EVGA PSU is bottom tier stuff, and that the PSU for the workstation is likely* of higher quality. It'll be fine, the RX570 isn't a power monster and as long as you don't have like dozen+ hard drives or something connected to it it will be just fine for the RX570.

*I say "likely"because Delta Electronics makes some high end stuff, but they also manufacture stuff to whatever specifications their customers are giving them so there's no way of knowing how good that specific power supply is without looking at the components inside and test it properly. Add to this that it's about ten years old at this point.

You can take a picture of your 6P cable, it has a writing/code printed on the cable.

I don't see any text on the cable other than this, and there's no sticker.

I agree, that EVGA supply can have issues
EVGA 500W Review - Another One (PSU) Bites the Dust (youtube.com)

Okay, but that's not the point I'm discussing. To protect my device, I can replace the power supply with another one if using a 24-pin motherboard adapter is safer than using a 6-pin to 8-pin adapter just to power the graphics card from the original power supply.

I used a 6 to 8 pin on more power hungry cards. It'll be fine.

Will I face any problems even if the card is used at 100% and its temperature reaches 85°C?

 

[ty_ger]

Not possible to use the 12V rail, maybe current is too high?

I know this response is old, but it seemed not yet addressed.
Short answer: no.
Long answer, for the EVGA power supply in standby mode, there is no 12v turned on. You can't make 12v act like 12v standby when there is no 12v present in standby mode.
As Shrek pointed out, since there is only 5v standby present with that EVGA power supply in standby mode, with a boost converter, 5 volt standby can be converted to 12v standby, assuming the boost converter works properly and both have enough current rating.

Still, I think the best cost-effective solution is to use the workstation's power supply with a 6-pin to 8-pin adapter. The wire you showed could easily handle over 500 watts. The rating of the pins is what will limit you to 200 watts; which is still way more than you need with the motherboard already providing 60 to 75 watts through the PCI-E slot.

 

[Toothless]

View attachment 358413

View attachment 358414
I don't see any text on the cable other than this, and there's no sticker.

Okay, but that's not the point I'm discussing. To protect my device, I can replace the power supply with another one if using a 24-pin motherboard adapter is safer than using a 6-pin to 8-pin adapter just to power the graphics card from the original power supply.

Will I face any problems even if the card is used at 100% and its temperature reaches 85°C?

Use the OEM power supply, use the 6 to 8 pin since the card won't use over 150w, so that gives 75 from PCI slot and 75 from the 6/8 pin. The card is going to be fine. You're really making this more complicated than it needs to be.

 

[Rafael.luc]

We will do the calculations to make sure:

Drop Voltage =< 5% https://www.lifewire.com/power-supply-voltage-tolerances-2624583
Conector 6 PIN https://datasheet.octopart.com/350416-1-Tyco-Electronics-datasheet-507475.pdf#page=2
Resistance 18 AWG https://www.engineeringtoolbox.com/copper-wire-d_1429.html
I will assume a cable size of 0.6096 M (2 ft) and 3 ways: 3 positives and 3 negatives (return)

18 AWG-1000 ft@149°F = 7.51 OHM (Worst case)

1000 ft - 7.51 OHM
2 ft - X OHM
X = 0.01502 OHM
3 wire parallel:
X/3 = 0.0050066 OHM

Cable resistance in 3 ways (6 PIN) 18 AWG with 0.6 M is 0.0050066 OHM

Current:

I will assume 125W all over the cable

I = 125W/12V = 10.4166 A

Drop Voltage:

V = 0.0050066 OHM x 10.4166 A = 0.05215 V
12V - 0.05215 V = 11.947 V (voltage that GPU will receive)
Power lost in cable resistance = 0.05215 V X 10.4166 A = 0.5432 W
Voltage Drop = 0.5%

So you can use the 6 pin to 8 pin adapter in this case.


If a 10 meter (33 ft) cable ( 6 PIN-18 AWG) is used, Voltage Drop = 7.2% and voltage that GPU will receive 11.13 V and could not use.

 

[Shrek]

I will assume a cable size of 0.6096 M (2 ft)

2 ft to the card? that is 4 ft of cable.

View attachment 358413

Are you running 24/7?

Let's say you run at 200W (with monitor) for 8 hrs a day 5 days a week and a better power supply saves you 10%; now the saving is $5/year

 

[Noname1234]

Does the EVGA, who is standard ATX fit into the HP 230 at all without modding and drilling new holes?
My HP Z400 also not have standard ATX PSU

 

[eidairaman1]

Does the EVGA, who is standard ATX fit into the HP 230 at all without modding and drilling new holes?
My HP Z400 also not have standard ATX PSU

Picture of the unit you are talking about would be helpful

 

[Rafael.luc]

2 ft to the card? that is 4 ft of cable.

I'm thinking more about this, are you talking about considering positive and negative in the length of the cable?

 

[Noname1234]

Picture of the unit you are talking about would be helpful

Does it make sense? Because i was talking about my z400. HP have their own PSU's in different formats then the standard ATX. So its good to check if standard ATX fit in the 230

But a photo of a my standard ATX psu in Z400:

 

[lexluthermiester]

I'll need to use a 24-pin to 18-pin adapter to connect the power supply to the motherboard to do so.

Given this limitation...

Would it be better to use a 6-pin to 8-pin adapter to run the card on the workstation's existing power supply

...this is the better option. You're not going to overload the wires or the PSU with a 6 to 8 pin adapter cable.

 

[Shrek]

I'm thinking more about this, are you talking about considering positive and negative in the length of the cable?

No, just the voltage drop on the way there and again on the way back.