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Hardware projects / Re: Hacking an HP Z800 motherboard into a standard PC case
« Last post by bulls4ever on January 19, 2017, 03:30:15 pm »
You're absolutely right!  But when I press the power button, the fans spin up to the highest rpm, it does a system check and just hangs...I don't see the bios load up as usual.  All I know at this point is that it's not receiving enough power to power the gpu. 

weird, Id only have the fans run at max speed when I moved the motherboard to a hacked case and didn't have the main cable attached: It does have a temperature sensor and without it the fans would spin at max speed no matter what. to solve the issue, I grabbed the cable and hacked it into my case.
I got busy and didn't take the pictures, but I will do it soon :)
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Hardware projects / Re: Hacking an HP Z800 motherboard into a standard PC case
« Last post by bulls4ever on January 19, 2017, 03:26:30 pm »
On a hacked system I run GTX 1080, Titan X Pascal and a Quadro K2200 without any issues. System load isn't that much. I measure the watts and 850W should be fine. My PSU is 1000W but it doesn't even come close to it on usage.

The original PSU has different amps than my "hacked" one . I believe the 850W cant power dual 100W+ CPU
I think the problem is the GPU Power and PSU incompatibility: the connector wont give enough power to the GPU.

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Hardware projects / Re: Hacking an HP Z800 motherboard into a standard PC case
« Last post by denj on January 16, 2017, 06:21:53 pm »
Well I've tried everything I could possibly think of... DPS-850DB /// 850W cannot support a 250W GPU....no matter how many kinds of connectors I throw at it. 

 :( >:( >:( :( :( >:( :( >:( :( >:( :( >:( :( >:( :( >:( :( :( >:(
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Hardware projects / Re: Hacking an HP Z800 motherboard into a standard PC case
« Last post by Andy Brown on January 16, 2017, 02:19:46 pm »
Quote
A few of the times the PC turned on, it immediately shutdown and the molex connector with two (12V + ground) was extremely hot to the touch. 
That actually sounds like a short to ground which definitely results in immediate shutdown (done it myself while messing with a modified USB connector and accidentally shorted 5V to ground. Oops.). If you have a multimeter you could probe the resistance from 12V to ground as a check.

Quote
My old card the 7850 would post and load up the bios after a little bit of delay which I assume is for checking the system stability
Yes a fairly large startup delay is normal with this board. I guess it's belt-and-braces checks for workstation-class boards.
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General discussion / Re: PCB's and SMD components
« Last post by Andy Brown on January 16, 2017, 02:11:37 pm »
Well... there are tutorials all over YouTube so I guess you're asking which ones I think are the best? I personally find Dave Jones' eevblog videos easy and enjoyable to watch.

Check out #186, 346, 434, 689. He's probably done more as well.
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Hardware projects / Re: Hacking an HP Z800 motherboard into a standard PC case
« Last post by denj on January 15, 2017, 04:45:47 pm »
You're absolutely right!  But when I press the power button, the fans spin up to the highest rpm, it does a system check and just hangs...I don't see the bios load up as usual.  All I know at this point is that it's not receiving enough power to power the gpu. 

When I used the connectors from the gpu card box (2x 6 pin into and 8 pin pci + 2x molex into 6 pin), I noticed that one of the 6 pin molex connectors was loose.  I made sure it was firmly in place and plugged the molex connector into the wiring hanging by CPU 1.  A few of the times the PC turned on, it immediately shutdown and the molex connector with two (12V + ground) was extremely hot to the touch. 

My old card the 7850 would post and load up the bios after a little bit of delay which I assume is for checking the system stability




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Hardware projects / NXA66 power supply controller board project
« Last post by Andy Brown on January 15, 2017, 01:27:18 am »
I've just published a new blog article and video that shows how I designed and built a controller board for the NXA66 power supply module that I investigated in a previous article.



Click here to go directly to the article to read more.
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Hardware projects / Re: Hacking an HP Z800 motherboard into a standard PC case
« Last post by mtothaj on January 14, 2017, 12:06:37 pm »
my CPU is an X5675.  I don't know if this matters or not but the GTX 1080 has a TDP of 180W. 

The R9 290X has a TDP of 250W. 

I'm assuming your GTX 1080 is only using the 8 pin or 2 x 6 pin since PCI interface provides 75W, 8 pin pci provides 150W and 6 pin pci provides 75W.   

Question for you all: Is it possible for me to run a 250W GPU (like my r9 290x) on 850W? 


What you are quoting is peak power draw figures. Even if the PSU was not man enough for the job (which I doubt is the case), the machine should still POST since power draw at that point is next to nothing.
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Hardware projects / Re: Hacking an HP Z800 motherboard into a standard PC case
« Last post by denj on January 13, 2017, 10:45:41 pm »
my CPU is an X5675.  I don't know if this matters or not but the GTX 1080 has a TDP of 180W. 

The R9 290X has a TDP of 250W. 

I'm assuming your GTX 1080 is only using the 8 pin or 2 x 6 pin since PCI interface provides 75W, 8 pin pci provides 150W and 6 pin pci provides 75W.   

Question for you all: Is it possible for me to run a 250W GPU (like my r9 290x) on 850W? 
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Hardware projects / Re: Hacking an HP Z800 motherboard into a standard PC case
« Last post by bulls4ever on January 13, 2017, 08:53:33 pm »
What is your CPU? With one 95w CPU a GTX 1080 was working on the original case
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