The problem, or at least one problem, is that you need PCIe power connected for that GPU. An R7 won't post either with monitor connected to just a GTX 1080 and GPU_power (PCIe) not connected. An RTX 2080 absolutely needs that power. So you should start by powering that header.
REPLYING TO:
I did not plug anything in the motherboard’s “GPU power” 8 pins socket on the motherboard, from which my previous Dell-supplied GeForce 1050 was powered
I have two 8 pins cable plugged to the two auxiliary power inputs of the RTX - I’m using a Corsair TX750M PSU - and two white LEDs are lit up above these
I hope I'm wrong but this could be the issue. Corsair TX750M specification shows there are only 2x 8-pin PCIe/ATX sockets that means you do not have enough connectors to satisfy both the motherboard and the Strix 2080. Each requires 2x 8-pin 12V main rail supply and the semi-modular TX750M only has 3 total, with 1 being part of the non-modular cable-out and 2 are modular.
What about your PSU from the R6? Was it a 460W or 850W power supply? Can you use that?
I do not recommend that you try to make the 6+2 work with your mobo nor try to expand on what you have. The keying is there for a purpose and while your PSU is rated for 750W, there are other factors like types of sinks allowed and the total current per rail.
If you cannot use your previous PSU, is it possible for you to exchange your PSU for a compatible one with Corsair or the retailer you bought it from? Maybe just reach out to them, tell them this issue and it's pure oversight, and see if they can help you out?
The Strix 2080 was on my list too until all my messing around with my R8 made me realize this magic number: 268mm. Anything more than this and it doesn't fit in the chassis. The NZXT H-series is a good choice. You chose a good case and card, unfortunately the PSU needs some work. Good luck.
Thanks. You are right, I have only one 4+4 ATX and two 6+2 PCI cables, but each of these 6+2 PCI cables are actually 2x(6+2) so in effect I have 4 (assuming wattage remains sufficient). Unfortunately, the motherboard GPU socket doesn’t seem to accept 6+2 PCI as per my post above
You were all indeed right about the need to power up the GPU power header/socket on the mobo.
However, I realised/remembered that my Corsair PSU’s non modular ATX/CPU cable was actually a 2x4 pins (the thing with two heads) and I had initially plugged both ends in the CPU power and the GPU power back when my OEM GeForce 1050 was in place.
So I keep my two existing 8 pins PCI cables in the RTX auxiliary power and stretched the ATX/CPU cable to plug the second head again in the GPU power socket on the mobo. I boot and the card fully comes to life!
Hello and sorry for the delay in replying. It was my first time changing a case, which is essentially building a computer from scratch. It was actually quite easy, the only problem stems from the fact that the Alienware motherboard uses proprietary designs for the on/off power switch, which means that I have to have the original Alienware power button and cable and some of the LEDs dangling from my new case to be able to turn the computer on. It’s not aesthetic but the whole machine works so I’m overall happy.
the truth is there is no ATX standard for the power switch nor power LEDs. zero standards.
the wiki on ATX covers this, if you wish.
the manual; for each GPU card made tells you what to do.
remove old drivers in windows for old GPU. card first.
all AC power to PC removed, and caps discharged (ask) (mind the x16 slot lock do not force the locked card, pulling it out. then in goes the new card.
then connect 1 or 2 Aux jack if 2 are there both need to have spec power it the card fail, or BIOS or artificating.
power is not an option on any GPU card made. ( if no AUX jacks all (gtx1050) or , 1 or 2 ) and correct amps behind it. (PSU) like the GTX1650 or RTX1660, all must have full power, or they fail.....
I think gamers do this wrong mostly, they keep upgrading and failing, 1million posts on the web all the same and for the same reasons, sigh.
or they upgraded GPU with bad PSU one with old bad CAPS in the PCU and has huge chopper noise (SMPS)
always consider a fresh PSU with a very powerful new card. if the PC is old. (the ones with Caps from Japan , yah)
r72019
6 Professor
•
5.3K Posts
0
August 27th, 2019 17:00
The problem, or at least one problem, is that you need PCIe power connected for that GPU. An R7 won't post either with monitor connected to just a GTX 1080 and GPU_power (PCIe) not connected. An RTX 2080 absolutely needs that power. So you should start by powering that header.
REPLYING TO:
I did not plug anything in the motherboard’s “GPU power” 8 pins socket on the motherboard, from which my previous Dell-supplied GeForce 1050 was powered
amstel78
2 Intern
•
402 Posts
0
August 27th, 2019 18:00
Check this thread regarding Nvidia drivers.
https://www.dell.com/community/Alienware-Desktops/Aurora-R8-Nvidia-Control-Panel/td-p/6235704/page/2
GTS81
2 Intern
•
2.2K Posts
0
August 27th, 2019 20:00
I hope I'm wrong but this could be the issue. Corsair TX750M specification shows there are only 2x 8-pin PCIe/ATX sockets that means you do not have enough connectors to satisfy both the motherboard and the Strix 2080. Each requires 2x 8-pin 12V main rail supply and the semi-modular TX750M only has 3 total, with 1 being part of the non-modular cable-out and 2 are modular.
Kahss
5 Posts
0
August 27th, 2019 22:00
Thanks, I’m trying to do this now but unfortunately I appear to be hitting another compatibility problem with my market PSU and what appears to be an OEM motherboard GPU power pins: https://forums.tomshardware.com/threads/psu-wont-fit-alienware-r6-please-help.3323590/
GTS81
2 Intern
•
2.2K Posts
0
August 27th, 2019 23:00
What about your PSU from the R6? Was it a 460W or 850W power supply? Can you use that?
I do not recommend that you try to make the 6+2 work with your mobo nor try to expand on what you have. The keying is there for a purpose and while your PSU is rated for 750W, there are other factors like types of sinks allowed and the total current per rail.
If you cannot use your previous PSU, is it possible for you to exchange your PSU for a compatible one with Corsair or the retailer you bought it from? Maybe just reach out to them, tell them this issue and it's pure oversight, and see if they can help you out?
The Strix 2080 was on my list too until all my messing around with my R8 made me realize this magic number: 268mm. Anything more than this and it doesn't fit in the chassis. The NZXT H-series is a good choice. You chose a good case and card, unfortunately the PSU needs some work. Good luck.
Kahss
5 Posts
0
August 27th, 2019 23:00
Thanks. You are right, I have only one 4+4 ATX and two 6+2 PCI cables, but each of these 6+2 PCI cables are actually 2x(6+2) so in effect I have 4 (assuming wattage remains sufficient). Unfortunately, the motherboard GPU socket doesn’t seem to accept 6+2 PCI as per my post above
Kahss
5 Posts
1
August 28th, 2019 02:00
Thanks everyone, I figured it out!
You were all indeed right about the need to power up the GPU power header/socket on the mobo.
However, I realised/remembered that my Corsair PSU’s non modular ATX/CPU cable was actually a 2x4 pins (the thing with two heads) and I had initially plugged both ends in the CPU power and the GPU power back when my OEM GeForce 1050 was in place.
So I keep my two existing 8 pins PCI cables in the RTX auxiliary power and stretched the ATX/CPU cable to plug the second head again in the GPU power socket on the mobo. I boot and the card fully comes to life!
What an adventure that was, thanks for your help!
nichu010
7 Posts
0
October 20th, 2019 19:00
Hi,
I want to upgrade from 1070 on my R6 to a RTX 2080 super.
I got 850W PSU.
How hard was to change the case.
cheers,
Nish
Kahss
5 Posts
0
November 3rd, 2019 05:00
Hello and sorry for the delay in replying. It was my first time changing a case, which is essentially building a computer from scratch. It was actually quite easy, the only problem stems from the fact that the Alienware motherboard uses proprietary designs for the on/off power switch, which means that I have to have the original Alienware power button and cable and some of the LEDs dangling from my new case to be able to turn the computer on. It’s not aesthetic but the whole machine works so I’m overall happy.
savvy2
3 Apprentice
•
2.5K Posts
0
November 3rd, 2019 07:00
almost true
Alienware motherboard uses proprietary?
the truth is there is no ATX standard for the power switch nor power LEDs. zero standards.
the wiki on ATX covers this, if you wish.
the manual; for each GPU card made tells you what to do.
remove old drivers in windows for old GPU. card first.
all AC power to PC removed, and caps discharged (ask) (mind the x16 slot lock do not force the locked card, pulling it out. then in goes the new card.
then connect 1 or 2 Aux jack if 2 are there both need to have spec power it the card fail, or BIOS or artificating.
power is not an option on any GPU card made. ( if no AUX jacks all (gtx1050) or , 1 or 2 ) and correct amps behind it. (PSU) like the GTX1650 or RTX1660, all must have full power, or they fail.....
I think gamers do this wrong mostly, they keep upgrading and failing, 1million posts on the web all the same and for the same reasons, sigh.
or they upgraded GPU with bad PSU one with old bad CAPS in the PCU and has huge chopper noise (SMPS)
always consider a fresh PSU with a very powerful new card. if the PC is old. (the ones with Caps from Japan , yah)