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AMD HD6450 PCI-E 2.0x16 x1 2.0 bandwidth question

post #1 of 18
Thread Starter 
I tried googling this to no real avail.

I put an HD6450 in my 3rd PCI-E slot and its registering at x1. I consulted my mobo manual and this is correct (apparently all the x1 and 3rd pci-e x4 slot all share the bw). My question is whether the x1 is limiting the 6450 at all. I'm seeing some "strange" behavior from it like 66% gpu usage in gpu-z when playing an hd video on that monitor its driving. I realize the 6450 is already like the slowest card there is, but is x1 limiting it even further?
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post #2 of 18
Quote:
Originally Posted by ThaSpacePope View Post

I tried googling this to no real avail.
I put an HD6450 in my 3rd PCI-E slot and its registering at x1. I consulted my mobo manual and this is correct (apparently all the x1 and 3rd pci-e x4 slot all share the bw). My question is whether the x1 is limiting the 6450 at all. I'm seeing some "strange" behavior from it like 66% gpu usage in gpu-z when playing an hd video on that monitor its driving. I realize the 6450 is already like the slowest card there is, but is x1 limiting it even further?

No.
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post #3 of 18
Thread Starter 
Quote:
Originally Posted by trumpet-205 View Post

No.

Do you or anyone else know the bw limits for x1? The wikipedia page doesn't have a table and im wondering if x1 is = pci-e 1.0 ?
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post #4 of 18
Quote:
Originally Posted by ThaSpacePope View Post

Do you or anyone else know the bw limits for x1? The wikipedia page doesn't have a table and im wondering if x1 is = pci-e 1.0 ?

PCIe 2.0 x1 can do 500 MB/s per direction.

x1 refers to the lane.

PCIe 1.0 refers to the specification.

Think of PCIe x.x as speed limit of the highway, and that x1/x4/x8/x16 as number of lanes on that highway.
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post #5 of 18
Thread Starter 
I found the answer:

PCI-e 2.0 or 2.1:
PCI-e x1 = 5 GTexels/sec
PCI-e x4 = 20 GTex/sec
PCI-e x16 = 80 GTex/sec

PCI-e 1.0 =

PCI-e 1.0 x 1 = 2.5Gtexels/sec

According to GPU-z, the texture fillrate of my 6450 = 6.1GTexel/sec so it appears that yes, the x1 lane IS limiting my 6450 (x4 would not).

Real question: Anyone know what a typical HD video would need in terms of bandwidth? Say a blu-ray?
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post #6 of 18
Quote:
Originally Posted by ThaSpacePope View Post

I found the answer:
PCI-e 2.0 or 2.1:
PCI-e x1 = 5 GTexels/sec
PCI-e x4 = 20 GTex/sec
PCI-e x16 = 80 GTex/sec
PCI-e 1.0 =
PCI-e 1.0 x 1 = 2.5Gtexels/sec
According to GPU-z, the texture fillrate of my 6450 = 6.1GTexel/sec so it appears that yes, the x1 lane IS limiting my 6450 (x4 would not).
Real question: Anyone know what a typical HD video would need in terms of bandwidth? Say a blu-ray?

Uh no. WRONG! GT/s is gigatransfer per second. It refers to the number of operation per second. Texture fill rate has absolutely nothing to do with GT/s.
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post #7 of 18

Is there a particular reason you don't want to install the card to PCIe2.0x16_1 @x16?

 

At PCIe 2.0x16_ 3 @x1 you will notice lag.

 

 

Capture.JPGCapture4.JPG

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post #8 of 18
Quote:
Originally Posted by Ken1649 View Post

Is there a particular reason you don't want to install the card to PCIe2.0x16_1 @x16?

At PCIe 2.0x16_ 3 @x1 you will notice lag.

600x639px-LL-07f3d34b_Capture.jpeg543x249px-LL-a474362d_Capture4.jpeg

That is true x16 slot uses PCIe lanes from CPU, other PCIe slot is routed to chipset first before going to the CPU.

x1 will not bottleneck 6450. Okay?
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post #9 of 18

Sorry, not going to argue opinions over facts.

 

@OP, put the card to the first PCIe 2.0 x16_1 @16.

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post #10 of 18
Thread Starter 
Quote:
Originally Posted by trumpet-205 View Post

Uh no. WRONG! GT/s is gigatransfer per second. It refers to the number of operation per second. Texture fill rate has absolutely nothing to do with GT/s.

Ok. Can you link where you got this information? I'd like to read up on it.
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