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Does a 3.0 slot Graphics card work on a 4.0 slot.

Eddieo
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Hello, I was helping my friend today build their computer and it wouldn't boot. I went to look at the Q-Led which was white. This indicated the graphics card(VGA) wasn't working properly. I tried both slots on the motherboard and it still didn't work. I tried different HDMI and display port cables and still nothing. I brought the graphics card home and put it in my system and it worked perfectly fine. My motherboard has a 3.0 pcie slot and theirs has a 4.0 slot. I was wondering if I overlooked the fact that a 3.0 slot card doesn't work on a 4.0 slot motherboard. I'm thinking its between the slot not being compatible with the graphics card or the motherboard is broken.    

The system turns on and has power but it does not post at all. 

Parts

i5-10400F

Asus b560m-A

gtx 1650 oc

 

 

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It should work yes, but in rare instances you may need to manually put the PCIE slot to 3.0 to get it to work. This is more common when using a PCIE Riser cable. 

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17 minutes ago, Eddieo said:

i5-10400F

Asus b560m-A

Because 10th gen Intel only supports PCIe Gen 3, the slot will only run at Gen 3 speeds anyway. 

 

PCIe always works at the lowest common speed between them, so if the slot was gen 4 and the card was Gen 2, it would function just fine at gen 2 speeds. If it was a Gen 2 slot and a gen 4 card, it would function at gen 2 speeds. If it was a gen 4 slot, a gen 4 card, and a gen 3 CPU, it will function at gen 3 speeds.

 

The beauty of PCIe is that it's forwards and backwards compatible. Basically, if the card fits in the slot, it'll work (there are a few exceptions, but they're incredibly rare). 

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2 hours ago, Skiiwee29 said:

It should work yes, but in rare instances you may need to manually put the PCIE slot to 3.0 to get it to work. This is more common when using a PCIE Riser cable. 

No, thats only if you are using a 4.0 card in a 4.0 slot with a bad riser, this has nothing to do with that.

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You would need to use an adapter or manually add the slot because I would assume that the slots would not be compatible. Also make sure your motherboard can use it.

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