Video summary

PCIe Riser Cables have Problems... vs Gen 5 GPUs

Main summary

Key takeaways

Product Review

Product reviewed

PCIe x16 riser cables (for vertical GPU mounting), tested across PCIe Gen 3, Gen 4, and Gen 5—with particular focus on compatibility issues when used with newer GPUs (notably Gen 5-era cards) and mini-ITX AM5 systems.

Key findings / unique points mentioned

1) Major problem (symptoms)

Builds would sometimes “finish” installation/boot and then exhibit issues such as:

  • No signal on boot
  • Fuzzy screen
  • Skipping / programs behaving incorrectly

These issues were reported as widespread across recent mini-ITX builds. The reviewer saw problems across:

  • Multiple PCIe riser cables
  • Multiple motherboards

2) Overall test lineup (what was tested)

Riser cables tested

  • Gen 3 x16 risers
    • Two different Gen 3 units mentioned
  • Gen 4 x16 risers
    • Two different Gen 4 units mentioned
    • One example brand: Len Lee
    • Another Gen 4 cable was “included with an Antec build”
  • Gen 5 x16 riser (main focus)
    • From AliExpress

Motherboards/CPUs used

  • AM5: B650E “Strix” (ASUS) + Ryzen 7 9800X3D
  • Intel: ASRock Z690 Phantom Gaming ITX / Thunderbolt 4 + 12900KS
  • Intel fallback: i9-10900K on Z490 (“10900K Z490” setup)

3) The “best” result: Gen 5 riser cable (AliExpress)

This was described as the most reliable option.

It worked with every GPU tested, including:

  • RTX 5090 Founders Edition
  • RX 5060 XT
  • Additional cards were referenced broadly (e.g., RTX 560 Ti, RX 970 XT, RX 960 XT, RX 9060 XT, etc.), though some model naming appears inconsistent in subtitles.

It also passed FurMark 2 (GPU stress testing) without issues.

Cost context

  • The Gen 5 x16 cable was expensive:
    • AliExpress: ~$100 AUD
    • A local option was mentioned as around $30 AUD just for a cable (suggesting cheaper local availability than AliExpress at the time the reviewer looked, but the subtitle implies the AliExpress option still ended up being the only “reasonable” choice).
  • The reviewer ultimately chose the AliExpress cable due to price/availability constraints.

4) Gen 4 riser cables: inconsistent / broken on AM5 with newer GPUs

On AM5, issues appeared especially with RTX 5090:

  • Would not boot on Gen 4 riser with most cards tested
  • Exception: RTX 5060 Ti (an x8 card) could boot

RTX 5090 behavior was reported as worsening:

  • In some cases it failed even on Gen 3 settings
  • Symptoms included input lag, skipping, and weird GPU usage behavior (e.g., not hitting 100% during FurMark-like loads)

For some AMD cards on AM5:

  • Black screen outcomes occurred
  • The workaround involved using onboard graphics to get a signal, then manually lowering PCIe generation (Gen 4 or Gen 3)

Even when Windows loaded on AM5:

  • Some AMD cards still didn’t “work properly” under Gen 4
  • Examples given: RX 970 XT / RX 960 XT required dropping to Gen 3

Important contrast: Intel behavior

Gen 4 risers were much better on Intel systems:

  • On Z690 + 12900KS:
    • GPUs worked when the user manually set PCIe generation
  • The main issue highlighted was auto-boot configuration on AM5
    • Intel required manual setting too, but stability was better once set.

5) Gen 3 riser cables: mixed; fails badly on AM5 for some newer AMD GPUs

Gen 3 was tested because it’s often budget-friendly (often under $10).

Observed patterns:

  • Intel systems (10900K/Z490): mostly worked fine
  • On 12900KS:
    • RTX 5060 Ti booted in Gen 3, but crashed in Gen 4 when used with this Gen 3 cable
  • On AM5:
    • NVIDIA: RTX 5060 Ti worked in Gen 3
    • RTX 5090: worked only at Gen 2
    • AMD cards (e.g., 9070 XT / 960 XT): would not boot, even when forcing Gen 2 or Gen 1

The reviewer emphasized they tried two different Gen 3 cables, yet the same general AM5 + newer AMD GPU boot failure behavior occurred, implying it wasn’t just a single defective riser.

6) Cross-platform conclusion drawn by the reviewer (root recommendation)

Based on testing across multiple motherboards/brands, the reviewer concluded:

  • With AM5 + newer GPUs + riser cables, compatibility issues appear widespread
  • The primary exception is using a Gen 5 riser cable

They also tested AM5 boards from multiple brands (subtitles mention ASUS, ASRock, and a Jingu AliExpress source, plus Gigabyte), all producing “bizarre results” unless paired with a Gen 5 riser.

7) Practical user experience advice (how to avoid pain)

Mini-ITX builds can be especially painful because risers can require costly dismantling.

Recommendations:

  • If you must use anything other than Gen 5:
    • Assemble outside the case first
    • Boot and run a benchmark before final mini-ITX installation
  • For Intel:
    • Expect to manually set PCIe generation in BIOS before boot

8) Reviewer’s final stance (personal verdict)

Even though the AliExpress Gen 5 riser worked flawlessly in testing, the overall experience “left a bad taste.”

The reviewer’s main mini-ITX setup changed to:

  • A freestanding GPU bracket
  • GPU directly connected to the motherboard
  • No riser

Pros mentioned (for the winning Gen 5 cable)

  • Works across all tested GPUs (boot + benchmark stability)
  • Least troubleshooting
  • Saves time/hassle compared to problematic Gen 3/Gen 4 risers

Cons mentioned

  • High cost for a cable (AliExpress Gen 5 ~$100 AUD)
  • Gen 4 and Gen 3 risers can cause:
    • No signal / black screens
    • Crashes, fuzziness, skipping, performance instability
  • AM5 sensitivity to “wrong generation” risers and auto-configuration behavior

Comparisons made

Gen 5 vs Gen 3/Gen 4 risers

  • Gen 5: reliable across platforms and GPUs
  • Gen 4/Gen 3: unreliable on AM5, especially with newer/high-end GPUs (notably RTX 5090 and newer AMD GPUs)

AM5 vs Intel platforms

  • AM5: Gen 4 risers often fail/require manual intervention
  • Intel: generally more stable once PCIe gen is set manually

Ratings / numerical scores

  • No formal numeric product ratings (no stars/scores)
  • Notable numeric references were mostly pricing-related:
    • AliExpress Gen 5: ~$100 AUD
    • Gen 3 risers: often under $10
    • Other prices referenced around $30 AUD
  • Sponsor-related: cashback up to 1,500 AUD (not a product rating)

Concise verdict / recommendation

  • If you’re on AM5 and using a newer (Gen 5-class) GPU: get a Gen 5 x16 riser cable—described as the most reliable and least headache.
  • If you’re using Gen 4 or Gen 3 risers: expect troubleshooting, manual PCIe-gen setting, and ideally to test outside the case first (mini-ITX failures are especially painful).
  • Intel users: still likely need BIOS manual PCIe-gen selection, but results were more stable than on AM5.

Speakers / viewpoint breakdown

  • Single primary speaker (reviewer): all observations, compatibility issues, platform testing, and final recommendation.
  • Sponsor mention (AliExpress cashback / Ryzen promo): included only as context; stated as unrelated to the riser cable’s technical performance.

Original video