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by Tuna-Fish
2353 days ago
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On low end desktop (1151 and friends), there are 16 PCI-E lanes directly from the CPU (typically used by the GPU), and the rest are connected to the PCH, which connects to the CPU with DMI. The main problem with updating the PCH alone here is that the link between the CPU and the PCH is only ~4GB/s, so PCI-E 4.0 speeds for the lanes extending from the PCH are rather pointless. On HEDT and modern server, (2066 and friends), only about 8 of the PCI-E lanes come from the chipset, and the rest come directly from the CPU. The QPI and it's successor UPI is used to connect CPUs to each other, not to a chipset. |
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