Guide 08 PCIe Riser

Documentation snapshot: November 5, 2026. Community-reported guidance; GPU drivers, capture card firmware and Veyra versions may have changed. See Home for current links.

Veyra User Guide — 08 — PCIe Riser Guide

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I. When You Need a Riser Cable

• The graphics card is so thick that it physically blocks the PCIe x4 slot;
• the case is too short, so the side panel won't close once the capture card is in;
• the graphics card is mounted vertically (vertical bracket) and the motherboard slot is occupied;
• you want to give the capture card its own place at the bottom or side of the case.

A group member, verbatim: "I put fans at the bottom of the case and had nowhere left for the capture card, so I pulled it out with a riser cable." (MBForce) — that is also the most typical use: the riser is not for the graphics card, it's for the capture card.

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II. Three Myths to Clear Up First

Myth	Fact
"The 573 doesn't support riser cables"	That's the support-desk line. Group member MBForce ran a 573 through a riser cable (on an MSI X670E Gaming Plus WiFi) and HDR was fine; Aitor tested a 20cm riser and found no impact. The real limitation is signal quality, not a prohibition.
"A riser cable always costs performance"	With a decent cable, a graphics-card riser has almost no loss. A group member: "Riser cables are fine for a graphics card — no loss, just don't buy the cheap stuff." (Milk) The counter-example is someone who got burned by a shoddy cable: "Riser cables hurt performance; I've been burned before." (阿莫视觉) — the root cause is the cable, not the approach.
"Just buy any cheap one for a few dozen yuan"	A group member warned outright: "These riser cables have no real certification standard, so I don't dare buy the cheapest ones." He ended up buying from JD's self-operated store.

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III. Four Buying Criteria

1. Match the generation

• If the motherboard/card is PCIe 4.0, buy a cable labeled PCIe 4.0 first;
• running a 4.0 device on a 3.0 cable means dropping to 3.0 at best, or no detection / errors at worst.
• Capture cards themselves are mostly 3.0 x4 and don't ask much of the cable, but when the motherboard slot is 4.0, still buy a 4.0 cable.

2. The shorter the better

• 20–30cm is the safe zone; past 50cm the signal degrades noticeably and you get speed drops, corrupted images and flaky detection.
• Route the cable the long way round rather than buying 60cm for looks.

3. Lane count

• A capture card only needs x4, so x4/x8/x16 all work (a cable for an x16 slot works in an x4 card too).
• x16 cables meant for graphics cards are more expensive and stiffer; using one with a capture card is wasteful but compatible.

4. Shielding and build quality

• Look for a metal shielding layer, gold-plated connectors and a stiff cable body;
• prefer JD self-operated / brand-name cables; don't buy unbranded white-label ones.

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IV. Installation Points

1. Power off and unplug the power cable first, then remove the graphics card;
2. Plug one end of the riser into the motherboard slot and push it all the way in until you hear the latch click;
3. Fix the capture card on the other end and make sure the card is supported (bracket screw + zip ties / bracket); don't leave its weight hanging on the cable;
4. Route the cable clear of the graphics-card fans and hot zones, and keep the bend radius above 2cm — a hard right-angle fold is the number-one cause of a dead signal;
5. Put the graphics card back, taking care not to crush the ribbon cable.

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V. Verifying That It Runs at Full Speed

Once it's installed, use HWiNFO to check the PCIe link the capture card is on:

Metric	Normal value	What a problem looks like
Link width	x4	x1 → only good enough for 1080P
Link speed	3.0 / 4.0	Drops to 2.0 → YUY2 only reaches 50 fps
Max Payload	256B	128B → RGB24 4K60 doesn't reach full speed

The "the 573 only does 53 fps / input frame rate 33 fps" reports that keep coming up in the group are often just a link that isn't running at full speed (especially common on MSI AM4/AM5 boards — see section 5 of document 03). Changing slots, disabling the Wi-Fi card and adjusting the PCIe speed in the BIOS can all help.

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VI. When Not to Use a Riser Cable

• The motherboard has a free and unobstructed x4 slot → plug it straight in, don't bother;
• the case has room → plug it straight in;
• you only want 4K60 NV12 → buy a 10G-port USB card (T911 / G50); you don't need PCIe at all.

In one sentence: a riser cable is "the fix for having no slot", not "a way to gain performance".

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VII. Group Member Cases

User	Configuration	Result
MBForce	MSI X670E Gaming Plus WiFi + riser cable + GC573	Fans at the bottom of the case left no room; pulled it out with a riser cable, HDR normal
Aitor	20cm riser cable + GC573	Tested, no impact
李火旺	MATX board + riser cable	"Taking the graphics card out and fitting the riser is no problem." "I got it into my mATX board too."
阿莫视觉	Once used a shoddy riser cable	"It hurts performance; I've been burned before." → a counter-example: choosing the cable matters