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1 Rookie

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8 Posts

194

February 19th, 2024 22:07

Missing GPU power cables in my Dell 5820

I bought a 5820 today. There are no GPU cables, which are usually 6+2 pin cables at the output which are kept in a neat place at the back of the PCI area. <Private data removed from public view. DELL-Admin>

One item is "379-BBCY : No Additional Cable". Does that mean it came with none of these GPU cables?

What cables do I need to replace them? I think they plug into 8 pin female sockets on the PSU. But I don't know if I want one 8 pin male to two 6+2 pin male connectors, or two separate 8 pin female to 6+2 pin female connectors, leaving on of the PSU 8 pins free. I don't want to blow anything by over loading one of the 8 pin connectors on the CPU.

The guy I bought it from was using a P2000 card which didn't need to use a power cable. It drew enough power from PCI. I have a P4000 card to play with for the moment that I could place in the 5820. I think that doesn't need the cables. But I was going to put a GFX 580 8GN in the 5820, and that will require a power cable. I would like to kit the machine out with GPU cables anyway. Would a GFX 580 8GN work in the 5820? It is not on the small compatibility list. 

A second question, can someone please follow my link to my service tag and tell whether this machine can handle SAS drive? I think it can't, because it would need a controller. 

Last question, I stupidly snapped the (aluminium?) handle off the back. Taking out the PSU, it looks like that part loops through part of the case and perhaps could be replaced. Do people sell that part? I could always epoxy it back on, but I would worry about the strength.

Cheers!

7 Technologist

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10.3K Posts

February 20th, 2024 16:28

By GFX 580 8GN, do you actually mean Radeon RX580 8 GB which has 185W TDP?

The Corsair cable has standard pinout on the gpu side, but nonstandard pinout on the psu side.  Therefore one should never plug a Corsair type 4/3 cable in a non-Corsair psu or Dell power distribution board.

you can use the older slower PCI SAS controller cards in T5820 b/c it has one PCI slot.  most SAS HBA are PCI-e.
https://www.ebay.co.uk/itm/204660836488?

(edited)

1 Rookie

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8 Posts

February 19th, 2024 23:38

Would these cables work? Doesn't everyone use the same pins for these 8 and 6 pin cables?

https://www.ebay.co.uk/itm/284505910700

7 Technologist

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10.3K Posts

February 20th, 2024 00:44

It is very risky and highly discouraged to attempt use Corsair PCIe cable in Dell. That cable is designed for Corsair modular psu only with specific nonstandard pinout.

I think this is the Dell GPU cable that connects to the power board in T5820
DP/N 76VYK

76VYK DELL GPU POWER CABLE FOR DELL PRECISION 5820 ( T5820 ) / 7820 ( T7820 ) TOWER WORKSTATION - 25.5 INCH 8 PIN TO 6 PIN+2 PIN ( 6P+2P )

Assembly,Cable,Power,VGA1,8TO6+2PIN.


so the psu plugs into power board VVFXD, and various cables included gpu cable are connected to the power distribution board.  It is like a harness.
this pic shows how it looks.  The gpu cable DP/N is shown in it.

5 Practitioner

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4.6K Posts

February 20th, 2024 01:23

I can confirm that 076VYK is the correct part number of GPU power cable for Precision 5820.  But, the 425w power supply in your system does not support them.  You can not put a GFX 580 into your system.

You will need to source a 950w power supply to upgrade video cards.

7 Technologist

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10.3K Posts

February 20th, 2024 01:31

Great.thank Chino for pointing out the psu rating.

This video shows how to remove psu.if a securing latch is pressed it should be easy to remove psu without much force 

https://m.youtube.com/watch?v=ZvivJR4rWdc

This is the optional SAS controller for T5820, which OP does not have

PRINTED WIRING ASSY, CONTROLLER, HOST BUS ADAPTER, 9440-8I

MegaRAID SAS 9440-8i 12Gb/s PC Ie SATA/SAScontroller -SW RA ID 0, 1, 5, 10
YW3J6
PRINTED WIRING ASSY, CONTROLLER, HOST BUS ADAPTER, 9460-16I

MegaRAID SAS 9460-16i 12Gb/s P CIe SATA/SAS HW RAIDcontroller (4GBcache)
42PDX


“SAS drives with optional controllers and SED are available only on systems with Xeon W CPUs”

(edited)

7 Technologist

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10.3K Posts

February 20th, 2024 02:02

So I use the basic psu calculator to estimate psu need for RX580,

the calculator does not have W-2123 which is OP’s cpu

assuming cpu is W-3580, which has 130w tdp higher than the 120w tdp of W-2123

Load Wattage: 418 W
Recommended PSU Wattage: 468 W

so that calculator result seems to suggest a 425 W psu is borderline okay for RX580.  In either case it would not hurt to try using the current psu.  In the case gpu is underpowered, pc would just shut down

1 Rookie

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8 Posts

February 20th, 2024 15:57

"It is very risky and highly discouraged to attempt use Corsair PCIe cable in Dell. That cable is designed for Corsair modular psu only with specific nonstandard pinout."

The pins on the PCIe should all be standard. I can understand the 24 pin connector varying. I don't see why Dell would change the pins on the Dell end of the 8 pin connector. Imagine engineers all over the world mixing up vendor PCIe cables and having accidents. Dell would surely have some incompatible connector, on their end, so they couldn't be mixed up.

Thanks for the codes on the cables, SAS controllers.

The use of GFX 580, which is listed as having a 185w TDP in most places, and a 240w TDP in others, looks difficult in the 5820 with a 425w PSU. It is a pity that the PSU costs a lot on the second hand market. 

I have been looking at other cards, including the A2000, which are capable but "low" power; "Despite having more muscle than the RTX 3050, the A2000 is optimized to meet a typical board power of just 70 W." They sell for £250-£300 on ebay, which isn't bad. 

Is there a reason why PCI SAS controllers, so abundant on ebay and elsewhere, don't work on the Dell 5820?

Thank again for all your comments and suggestions. I love to talk about hardware. 

1 Rookie

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8 Posts

February 20th, 2024 20:15

@redxps630​ Thank you for your comprehensive answer. 

4 Operator

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1.1K Posts

February 20th, 2024 20:51

"Is there a reason why PCI SAS controllers, so abundant on ebay and elsewhere, don't work on the Dell 5820?"

The options dell sells are certified by dell and supported by their tech support, have some guides / videos ( I think ) , plus they include ( if the kit is factory installed, or purchased complete ) the cables to connect to the Flexbays.

You can obviously use other controllers , just at that point is not dell issue if something requires assistance ( under warranty ) , but an issue of the controller manufacturer support

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