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Skylake X can crunch out PCI-E 4.0 x 16 native for RTX 40

restsugavan
Level 13

Skylake X running PCIe 4.0 x 16 native.Skylake X running PCIe 4.0 x 16 native.

 

 

Skylake running great on 16GT/s PCIe 4.0 x 16.Skylake running great on 16GT/s PCIe 4.0 x 16.

 

No need CPU upgrade for PCIe 4.0 x 16.No need CPU upgrade for PCIe 4.0 x 16.

 

Windows 11 Canary Build 25951.1000 Core i9 7980XE 02007006 MCE ME 11.12.94.2479 RAMPAGE VI EXTREME OFFICIAL BIOS 3801 SAMSUNG OG9 FW 1019.0 NVIDIA RTX 4090 GAME READY 550.09 64GB GSKILL DDR4 16-18-18-36 3200MHz 970 EVO PLUS 1 TB x 3 HARMAN JBL 9.1 Sound Bar DOLBY ATMOS 9.1
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4 REPLIES 4

PanosXidis24
Level 11

can you explain what you say?

Murph_9000
Level 14

Your screenshots say the bus is running at 2.5 GT/s, which is PCIe 1.0 speed (the bus will drop its speed down automatically to save power).  Have you actually seen it running at a reported 16 GT/s?  I suspect HWiNFO is just telling you what the card's maximum capability is, but I don't think it will go beyond 8 GT/s due to both the CPU and the platform being PCIe 3.0.

Even the 10980XE is still PCIe 3.0 / 8 GT/s maximum, according to the Intel specs for it.

Exactly.

restsugavan
Level 13

Thank you everyone to correct me! 😁 The 4090 RTX paired with 7980XE running very fast. 

Compare to Gen 4 x 16 native system like Core i9 12900K almost identical performance. 

Windows 11 Canary Build 25951.1000 Core i9 7980XE 02007006 MCE ME 11.12.94.2479 RAMPAGE VI EXTREME OFFICIAL BIOS 3801 SAMSUNG OG9 FW 1019.0 NVIDIA RTX 4090 GAME READY 550.09 64GB GSKILL DDR4 16-18-18-36 3200MHz 970 EVO PLUS 1 TB x 3 HARMAN JBL 9.1 Sound Bar DOLBY ATMOS 9.1