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Just to close this off, thanks again to @-rascal- I have now fitted a new 1660 Super to my old motherboard in the x16 slot, and it works fine (71fps on Ultra 1080p in Tomb Raider). A long road to fixing this, but got there in the end. It seems my GTX780 has some weird fault where it works in the x4 slot but not the x16..... Huh?

Yes that is correct. This is great to know (super even....), thanks @-rascal-

Would appreciate your input @-rascal- Thanks.....

Ok. GTX260 has arrived and it works fine in the x16 slot, installed the driver and all seems well. (as an aside, having bought the cheapest card I could find for the test, it looks really crappy, made by "Point Of View", never heard of them) Over the weekend, I had restored my PC back to its original state, so this is using my original motherboard, the one I suspected to be faulty. Do I take it then, with reasonable certainty, that my GTX780 is in fact faulty in some way. How can it not work in the x16 slot but does work in the x4 slot? Assuming the answer is "faulty GTX780" then I guess I will have to get a new one, there isn't an easy fix for an amateur like me? I could get a second hand GTX780 here in the UK for around £120-£140, or I could just bite the bullet and go for a GTX1660 Super.....? Am I going to see a noticeable performance improvement for my £220 (1080p gaming on top titles like AC Odyssey, Tomb Raider and Grid 2019) Or in fact for around £160 would a GTX1650 Super provide a good upgrade from the GTX780? I don't want to spend a fortune, because the PC is already 6 years old.

The GTX260 is on its way, won't be here until next week. My power supply is a 6+2, so that is fine. Thanks for your help so far, I'll post back when the card has arrived and what the test revealed, so hopefully I can close this one off! (or not!)

Yes, mine is 6-pin + 8-pin, I THINK it is 6+2, will check tomorrow. Thanks for all your help so far.

So a GEForce GTX260 for £17.50 off ebay would do it? (I note the power connectors are a little different to mine, so would have to check that, probably cable tidied away in the case somewhere)

Thanks @gepowr I haven't got a spare GPU unfortunately, a friend who I thought might have a spare one, has not. When you say "as long as it fills all 16 lanes", what do you mean by this? It has to be a reasonably high-spec card I assume?

Thanks @-rascal- - I certainly hadn't banked on this as a potential fault....what you've said makes perfect sense. The only problem is, getting my hands on a processor to swap to confim/deny the issue. Here in the UK a 4770k is around £120 second hand, so not a small amount of money to fault-find.

Hi there, I have a Zotac 3Gb Nvidia GTX780 graphics card. My display suddenly went blank mid-gaming session and the PC rebooted, had to reboot again using the onboard Intel graphics. The GTX780 had disappeared from Device Manager. Moved the card to the 2nd PCIe slot and it worked fine. On that basis because the graphics card works fine in the 2nd slot I figured my motherboard must be at fault, so bought a new identical motherboard. Fitted that today and guess what, the fault is exactly the same. The card will not work in the main x16 PCIe slot, but works fine in the x4 slot. So despite thinking I had diagnosed the fault, it seems the graphics card is fault? Am I missing something? In order to get the graphics card working in the x4 slot, I have to disable onboard graphics....which isn't an issue to me. However, the same solution for the x16 slot results in the PC not booting at all, presumably because the PC does not see a functioning display adapter. System is: Gigabyte Z87-HD3 motherboard, latest F8 bios Zotac GTX780 graphics (tried latest drivers, no drivers and some older drivers - but card not even showing in Device Manager) 16Gb ram Intel Core i7-4770K (not overclocked) Windows 10, all latest updates

Thanks for replying everyone Based on what you've said (that it will make very little difference to cooling) then I will leave it alone for the time being. If any specific problem arises, like the WiFi card melting....or if I am in there adding/changing any other parts, then I'll reconsider. Thanks again, Carl

Hi there. I had my PC built here in the UK by Novatech computers and I am really happy with it. There is one question I have, which regards the positioning of the WiFi card and its proximity to the graphics card. The system itself is very quiet, but once I'm in a gaming session the 3 fans on the graphics card really start to make a bit of a noise....it isn't the end of the world, but noisier than I expected (temps peak around 75c). I wonder whether this is because the end fan has the WiFi card right up against it, I have tried to show this in the attached photo. It isn't easy to tell, but the WiFi card is just a few millimetres from the orange fan.... Do you think it is worth moving the WiFi card to a lower PCI slot, it is a full size case so I have the room. If the answer is 'yes', then can I just move it or will the system fail to recognise it any more, and are the other PCI slots likely to be compatible with it? Thanks for looking! Cheers, Carl

Hi Linus Media Group! I found you a few months ago whilst researching spec for a new PC, which I have now bought. In the end though, I got thoroughly distracted from my research by watching way too many of your video's and ended up subscribing. It is obvious you have a passion for what you do, and that just makes me want to keep on watching Keep up the good work. Cheers, Carl \m/