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09-04-2018 04:21 AM
I just bought ATI R7990 6GB DR5 for my Z800
After install in motherboard Z800 won't boot
Just tested the card in another pc it's ok no problem
Any one can help ?
Is the problem from bios ? -- I have lastest update
Which Z800 ? Version 1
Your previous Card ? - Quadro 4800
09-04-2018 05:48 AM - edited 09-04-2018 01:45 PM
The first ideas are:
1. Can you boot to BIOS? If so, check BIOS for disk mode setting: RAID, AHCI, and etc.
____When the BIOS was updated, these may have had values changed to default.
2. That there is a driver confiict in the z800.
_____Use a driver cleaner and if there is an option, use "clean install" and reinstall the driver
3. Check that there are 2X 8-pin 150W power connectors. The minimum recommended PSU is 750W. The z800 has either an 850W or 1110W PSU.
Let us know what happens.
09-04-2018 10:17 AM - edited 09-04-2018 10:19 AM
the ati 7990 draws just under 400 watts
the HP z800 (when using the 1100 watt optional power supply) came with a nvidia 5800 that was a 190 watt card
it would also support at the same time the NVIDIA Quadro CX card which has a 150 watt draw. the combined draw of both was around 340 watts the ATI 7970 card is 390 watts
the z800 1100 watt supply may not even be able to power this card if the 12 volt line draws more than what the supply can put out . this is why most current power supplies now use single rail designs
the stock z800 power supply (850 watts) is not going to be able to handle this load due to the total wattage and also the fact that the z800 power supply is not a single rail design, it's a multirail design which means that each voltage rail (5v 3.3v 12v) has a set wattage limit that when totaled up will equal the power supplies listed wattage it is quite easy to place a load on a power supply that is multirail which exceeds that rail's total wattage, but still be under the supply's total wattage
if you pull the z800 supply there is a label on the supply which lists what wattage each rail's max current/wattage draw is
why did HP use a multi rail supply? there are trade offs between each design, and multi rail designs were easer to regulate and get a higher efficancy rating for a reasionable cost are two reasions that i am aware of
09-04-2018 02:39 PM
1. If you replace the Quadro FX4800, does the system boot?
2. How many beeps are made when the system refuses to boot? What does the manual say as to that number of beeps with power button flashing red?
3. What was the power supply in the system in which the R7900-6GD5 worked?
I can not find a Passmark benchmark listing for the R7900, R7900-6GD5, or ATI Radeon HD 7990 in any of more than 68,000 Hewlett Packard systems tested. There are two listings in Dell, one is in a Precison T5600 (2X E5-2690), having a 2D of 569 and 3D of 3346. < That is a fairly low score. For comparison, the highest 3D score of a Quadro FX 4800 in a z800 is 1104. The T5600 had a PSU of 635W or 820W.
While the HD 7990 may have a Passmark 3D up to a maximum of 7951, that is in a 4.8GHz system. In the z800 with 2X Xeon X5690, an 8136 mark is achievable using a GTX 970, specified as requiring a minimum 500W power supply. If the problem is power supply limitation, consider a newer series 6 or 8GB GPU, GTX 970 , 980, 980 Ti. Probably, beyond those card, the CPU single-thread performance speed will limit 3D performance.