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Pciex4 and pciex16

Last response: in Graphics & Displays
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September 28, 2011 6:03:52 PM

hey, i have 2 video card slots on my motherboard in the motherboard book they both say pci express x16 but in brackets one has PCIEX4 and one has PCIEX16 i dont get it what does this mean are they the same speed?

More about : pciex4 pciex16

a b U Graphics card
September 28, 2011 6:07:16 PM

no they are not. PCIE x16 should be your top slot used for gaming for your card. if you were to run a dual card setup, the 2nd card would be running in the other slot at x4 and not x16 which could impact performance. If you plan on a single card solution, then you wont have any problem using the x16 slot and being happy. you were correct in assuming it is the " speed" of the slot
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a c 104 U Graphics card
a b V Motherboard
September 28, 2011 6:07:50 PM

Nope, not the same speed, the x16 is obviously a lot faster. It has to do with bandwith. Not an expert on that, somebody else will probably explain that better.
I think tough that when you use them both the second one will run with x4.
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a b U Graphics card
September 28, 2011 6:09:22 PM

GreenDutchAlien said:
Nope, not the same speed, the x16 is obviously a lot faster. It has to do with bandwith. Not an expert on that, somebody else will probably explain that better.
I think tough that when you use them both the second one will run with x4.

the x4 wont transfer as much data as fast; just like having a 128 bit interface vs 256 on a video card
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a c 104 U Graphics card
a b V Motherboard
September 28, 2011 6:09:46 PM

What he says.
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a c 104 U Graphics card
a b V Motherboard
September 28, 2011 6:11:03 PM

You type faster than i do, confusing this.
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a b U Graphics card
a b V Motherboard
September 28, 2011 6:11:09 PM

No, they aren't the same speed, the 2nd one is physically an x16 slot, but electrically an x4 slot. A true x4 slot would be shorter so they call it an x16 slot even though it only has the pins for an x4 slot.
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September 28, 2011 6:15:05 PM

ok thanks i was looking into getting a 2nd 5770 but that seems pointless ill just upgrade.
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a b U Graphics card
September 28, 2011 6:23:03 PM

a single card solution will do you just fine. the 5770 xfire is approx as fast as a single 5870, which the 6870 is very affordable, and performs very well in its price range with improved tesselation support.
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September 28, 2011 6:24:10 PM

The 4X slot is enough for a 5770...

You may lose a point or 2 over a 16X slot but nothing to worry about. There are a few articles about this here on Tom's.
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a b U Graphics card
September 28, 2011 6:25:03 PM

I would still go single card solution over a xfire 5770. now if it was a 460 then thats an easy decision.
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a b U Graphics card
a b V Motherboard
September 28, 2011 6:31:02 PM

I don't think 5770s had all that great of crossfire scaling anyways, and they are still around 100 bucks. I think you would be better off replacing if you feel you need to upgrade already.


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a b U Graphics card
September 28, 2011 6:38:00 PM

what is your budget? oh and your psu?
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September 28, 2011 7:39:59 PM

650 watt psu looking to spend no more than 200
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December 12, 2012 8:07:25 PM

i know this thread is old but on my BIOS im trying to tell my system to recognise my Graphics card in the X16 slot but it only gives me the 2 options of the system recognising the card in the X4 slot or the X1 slot any idea on how to make it recognise the X16 slot

Specs:
Gigabyte Z77 D3H Motherboard
XFX Radeon HD 7770 1GB Graphics card
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