Upgrading HP 6300 Pro Power Supply to run nVidia GTX 650

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BuildBuild

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Jun 11, 2013
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Hey All,

I recently purchased a HP 6300 Pro minitower (BTX SFF) that has a 320W PSU for a great price. I would like to put in a better and more powerful PSU to drive a nVidia GTX 650 graphics card and other peripherals. However, this appears to be an interesting problem:

The physical size of the OEM PSU is different than regular ATX PSUs (it's a little bit bigger). The connectors are also different. There is no 20/24pin main 12V cable. There are only 3 - an inline 6 pin, 4-pin, and 6-pin, all which connect to the motherboard. Here is an image of what the board looks like: http://www.aliexpress.com/item/Free-shipping-for-HP-6300-Pro-SFF-system-mainboard-for-657239-001-656961-001-chipset-Q75/906004623.html

Q1: Is there a compatible PSU out there somewhere (no english, no problem)?

Q2: Is there a workaround via adapters and cables, such as a SATA to 4-pin Molex, 4-pin Molex to PCIe?

Q3: If another PSU was used to solely power the graphics card, would this cause problems with the system/motherboard?

Q4: Should I just return this unit and start over with a different build (and with my tail between legs)?

Sincerely,
TJS

 
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clutchc

clutchc

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The easy answer is start over with a new build.
But check the specs on the PSU. It may handle the GTX 650. That is only a 64W TDP card. http://www.hwcompare.com/13457/geforce-gtx-650/
That's only 5.3A on the +12V rail. If your PSU has a PCIe 6-pin power cable, it may handle it.
 
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BuildBuild

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The PSU does not have a PCIe connector, that is a big part of the problem. Is there a way to get around this via cables & adapters (i.e. pulling from 12V 4-pin & going to 6Pin PCIe?




 
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BuildBuild

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Ok, I think (from label on PSU)

HP P/N 611484-001
The model # CFH0320AWWA Rev B
The CT # is 5BHTQ0C1Z2X6EB, standard efficiency
Bestec seems to be the manufacturer of the PSU

+12V Main 16A
+12V CPU 16A (12V main and 12V CPU together are rated at 320W)
-12 0.15A
+12Vsb 1.30A

If you could explain where the juice is going (i.e. each of the 3 cables, P1, P2, P3) that would be good too.

Cheers



 
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BuildBuild

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Yes, that is it.
No it does not. I was thinking of a workaround, such as male SATA to molex, and there are two SATA power cords, so if I get a 4-pin to Sata with an extension, I can connect the Sata to Molex to the Molex to PCIe cable. Not optimal, but may work??

-BuildBuild



 
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clutchc

clutchc

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I highly recommend following Sait19's advice and contact those folks about a PSU upgrade. Apparently, that PC was not intended for gaming.

I'm not sure I would do the SATA/Molex adapter. I think the SATA power connector's pins are not designed to carry the amount of current that the Molex connectors carry. I believe they are rated at 1.5A. If so, the card is capable of drawing over 5A at max load.
 
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BuildBuild

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Dear saint19,

I e-mailed the guys yesterday, still haven't heard back. :??:

I have until friday to return the system to Tigerdirect.com. Hopefully I can get all of my $ or credit to put towards a decent system built from the ground up, this time with an ATX PSU :D

One possible solution is to power the graphics card with its' own power supply, scavenged from an older system (it's a great power supply, Antec Earthwatts EA-500D), and run the PCIe Connector through one of the other PCIe slots in the rear of the case. Would this be possible? :??:

In theory, if this works, I could put in whatever graphics card I want, provided it fits in the case.

BuildBuild




 
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saint19

saint19

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That "extra" PSU should work, but keep in mind that you will have to use a little cable for turn on and remove the cable for turn off the PSU. Would work without problems, I had used 1200W PSUs for 2 or 3 GPUs and other PSU for the rest of the components, just make you sure that both PSU are good enough for the rig.
 
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BuildBuild

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Jun 11, 2013
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Dear saint19,

Thanks for the reply. OK, for clarification:

"use a little cable for turn on and remove the cable for turn off the PSU" You are just explaining that to remove the power source to the graphics card, I would need to remove the PCIe 6-pin power connector to the graphics card.

So the OEM PSU will power the CPU, board, and peripherals, and the Antec EA-500D will power the nVidia GeForce GTX 650 (via the 6-pin PCIe connector).

Just one last question...Is it possible that the GTX 650 (with a TDP of 65W) could be powered solely by the 75W Ivy Bridge PCIe 3.0 slot?

Sincerely,
BuildBuild



 
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saint19

saint19

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No, Check this picture:

atx-power-bypass.jpg


You will have to do the same for turn on and turn off the PSU for the GPU, when I said "remove the little cable", I mean just remove that "bridge" between black and green cable and the PSU will turn off.

Regarding your other question, no, that's not possible.
 
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BuildBuild

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saint19,

Is that a paperclip?

Would any wire work (i.e. speaker wire)?

Would switching the PSU off work as well?

Sincerely,
BuildBuild




 
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clutchc

clutchc

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Any graphic card with a 6/8 pin power connector on it will not work unless it has power to it, even though the 75W slot would be sufficient.

That's why I was hesitant to recommend powering the card with the SATA/MOLEX/PCIe adapter. Even tho the slot would provide the bulk of the necessary current, I didn't want to recommend such a jury-rig. It's hard to say which path is the path of least resistance and which path would carry the bulk of the load. But if you feel like trying it, that's up to you.

Btw, the paper clip trick simply grounds a signal wire to to provide a permissive to turn on the PSU.
 
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saint19

saint19

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Yeah, any wire should work without problems, you only need to keep the paperclip or wire in the same way as the picture while your rig is turned on and remove the wire or paperclip when the rig power off.
 
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