Other Question about PCIE extension cables

[SFF Scrub]

So using a PCIE cable has to add at least a little bit of latency to whatever device you are hooking it up to. I'm most interested in what kind of performance decreases/latency increases I could expect when hooking up a GPU this way.

Thanks for anyone who answers, if possible I would appreciate a link to an area I could read about this along with your answer.

 

[cleveland]

No more than 5%, if the extender is of good quality, that's for sure.

 

[brbbq]

There were no performance loss with these maybe after some time the riser can deteriorate and the performance decrease

 

[darksidecookie]

LTT did a video (now on floatplane) where they measured after how many pcie extentions there was a noticable drop in fps.
After about 2,5m of extentions the 650ti didn't want to work anymore but the titan x didn't even drop frames until after some more extentions.

 

[Chrizz]

LTT did a video (now on floatplane) where they measured after how many pcie extentions there was a noticable drop in fps.
After about 2,5m of extentions the 650ti didn't want to work anymore but the titan x didn't even drop frames until after some more extentions.

Which cable did they use?

 

[darksidecookie]

Which cable did they use?

a mix of 1meter and 30cm thermaltake premium extenders

 

[SFF Scrub]

LTT did a video (now on floatplane) where they measured after how many pcie extentions there was a noticable drop in fps.
After about 2,5m of extentions the 650ti didn't want to work anymore but the titan x didn't even drop frames until after some more extentions.

Just to make sure I have this correct. Are you saying that they were using extension cables that were 2.5 meters OR 8.2 feet?

 

[EdZ]

Repost:

A riser will operate in broadly 4 states:

1) Fully functioning, no performance impact whatsoever.

2) Fully functioning in a lower link speed (e.g. bumped down to PCIe 2.0 speeds or even PCIe 1.0 speeds). This may have a minimal impact to performance

3) Intermittently functional. This is usually the case for an unshielded riser. The riser will work at full speed, but will sometimes cause the system to hang or crash. Can sometimes be 'fixed' by manually falling back to a lower performance mode, in which case you are back at option 2.

4) Completely non-functional.

Basically, a riser with either work without any latency, work at a lower link speed without any latency, or not work. As long as you have a decent riser (i.e. not a cheap unshielded ribbon cable) or a broken riser, there will be zero impact on performance.

 

[SFF Scrub]

Thanks. That helps

 

[darksidecookie]

Just to make sure I have this correct. Are you saying that they were using extension cables that were 2.5 meters OR 8.2 feet?

yes, they even had somebody hold the gpu because they ran out of table to lay the combined risers out flat.
(note: they used a separate psu to power the gpu)

 

[SFF Scrub]

yes, they even had somebody hold the gpu because they ran out of table to lay the combined risers out flat.
(note: they used a separate psu to power the gpu)

Why a separate psu for gpu?

 

[darksidecookie]

Why a separate psu for gpu?

because the cables from the psu of the pc dind't reach 2,5+ meters and they wanted to get the gpu as far away from the pc as possible.