Sign in with
Sign up | Sign in
Your question

Would a PCI-E x16 card (GTX 770 specifically) Work on a PCIE-X1 slot?

Last response: in Graphics & Displays
Share
June 24, 2014 11:02:43 PM

Hello,

I have an Acer desktop. It came built with a GTX 770 2GB. According to Speccy, by Piriform, it has one free PCI-E x1 slot available (well it has 2 actually) as the motherboard only has one x16 slot which is of course in use.

Do you think it would be suitable to run a second GTX 770 2GB in the PCI-E x1 slot??

Finally, the machine has a 500w supply; Unsure if for SLI it would need a bigger PSU.

Thanks in Advance Tom's Hardware users for any insights.

E. Rowlands
June 24, 2014 11:18:18 PM

Your current PSU will not survive two GTX 770s in SLI; you will need a top-tier brand 750w or greater PSU for that. Also, there's not much of a chance that your Acer's motherboard will support SLI.
m
1
l
June 24, 2014 11:19:12 PM

Your PSU isn't big enough. For 2 GTX 770s, you'll want at least 650w. Yes, running it in a PCIe x1 slot would be compatible. However, even if you did have a bigger PSU, that you lower your gaming performance massively. You will only be getting 1/16th of the bandwidth it needs, so the second card would be miles behind your first card, causing your game to run like absolute crap. If you want more performance, you should look into overclocking if you haven't already as overclocking and yield very impressive gains.
m
0
l
Related resources
June 24, 2014 11:33:22 PM

If you want full performance of running two GTX 770s in SLI, then you will need an LGA 2011 motherboard and at least an i7-4820k CPU since the X79 chipset supports up to 40 PCI-E lanes, as opposed to 16 PCI-E lanes in LGA 1150 / 1155 motherboards. But if your PC is still under warranty, then you should hold off on such upgrades until the end of your warranty.
m
1
l
June 24, 2014 11:48:42 PM

I am pretty unsure a generic power supply of 500 watts can actually run ONE GTX770. In fact , so unsure am I of the info you have supplied I would urge you to check the graphics card again;
Are you sure it is not an HD 7770? A GTX770 would come with a system costing WELL over $1000 us, while an hd7770 is more normal.
m
0
l
June 25, 2014 12:01:42 AM

just to add, don't use it at x1, it is very limited
m
1
l
June 25, 2014 12:07:29 AM

Joseph DeGarmo said:
If you want full performance of running two GTX 770s in SLI, then you will need an LGA 2011 motherboard and at least an i7-4820k CPU since the X79 chipset supports up to 40 PCI-E lanes, as opposed to 16 PCI-E lanes in LGA 1150 / 1155 motherboards. But if your PC is still under warranty, then you should hold off on such upgrades until the end of your warranty.


That's bologne. You can run 2x770s without issue a x8 speeds without losing performance at all. That's the same speed as PCIe 2.0 at x16 speeds which is still enough for the highest end cards. GTX 770s don't use even close to that bandwidth.

EDIT: You're thinking of 3 way SLI/CFx, otherwise you're massively misinformed.
m
0
l
June 25, 2014 12:09:21 AM

tea urchin said:
I am pretty unsure a generic power supply of 500 watts can actually run ONE GTX770. In fact , so unsure am I of the info you have supplied I would urge you to check the graphics card again;
Are you sure it is not an HD 7770? A GTX770 would come with a system costing WELL over $1000 us, while an hd7770 is more normal.


It is below the recommendation of 600W, however those are largely exaggerated to ensure compatibility with even the oldest crappiest PSUs out there.
m
0
l
June 25, 2014 1:08:04 AM

I can't stress enough on how helpful those replies have been.

Thank you.

Joseph Degarmo and Marshal11 I appreciate your insights.

Selecting best answer for Marshal as his answer gives me some hope for SLI in the future - although I've taken on board the PSU issue and warranty upgrade scenario etc :) )

m
0
l
June 25, 2014 1:15:12 AM

tea urchin said:
I am pretty unsure a generic power supply of 500 watts can actually run ONE GTX770. In fact , so unsure am I of the info you have supplied I would urge you to check the graphics card again;
Are you sure it is not an HD 7770? A GTX770 would come with a system costing WELL over $1000 us, while an hd7770 is more normal.



Haha, fair one. But no, here's me specs from Speccy -

Operating System
Windows 8.1 64-bit
CPU
Intel Core i7 4770 @ 3.40GHz 26 °C
Haswell 22nm Technology
RAM
16.0GB Dual-Channel DDR3 @ 799MHz (11-11-11-28)
Motherboard
Acer Predator G3-605 (LGA1150) 28 °C
Graphics
G246HL (1920x1080@60Hz)
2047MB NVIDIA GeForce GTX 770 (Sapphire/PCPartner) 31 °C
Storage
1863GB Seagate ST2000DM001-1CH164 (SATA) 35 °C
Optical Drives
HL-DT-ST DVDRAM GT90N
Audio
Realtek High Definition Audio


m
0
l
June 25, 2014 1:26:43 AM

Just to clarify, from the information, I actually will not be using SLI - I wouldn't fancy a £250 card throttling my other £250 card, all for the sake of having two GPUs.
Will stick with 1 gpu and try to overclock some more - managed to get an extra 100mhz out of the core clock, and an extra 200mhz out of the memory using Afterburner. After a heck of a lot of research, that seemed to be a stable limit. It got the machine an extra 5-7fps on the recomended heaven benchmark which is fair!

Guys, thanks again. Issue clarified.
m
0
l
!