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

restsugavan
Level 15

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.

 

W11 25H2 27842.1000 Core i9 7980XE 02007206 MCE ME 11.12.97.2614 R6E Modified BIOS 4201 SAMSUNG OG9 FW 1020.0 SSD 970 EVO PLUS 1 TB x 3 NVIDIA RTX 4090 GAME READY 576.40 64GB GSKILL DDR4 3200MHz JBL 9.1 Sound Bar DTS-X
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4 REPLIES 4

PanosXidis24
Level 12

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 15

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. 

W11 25H2 27842.1000 Core i9 7980XE 02007206 MCE ME 11.12.97.2614 R6E Modified BIOS 4201 SAMSUNG OG9 FW 1020.0 SSD 970 EVO PLUS 1 TB x 3 NVIDIA RTX 4090 GAME READY 576.40 64GB GSKILL DDR4 3200MHz JBL 9.1 Sound Bar DTS-X