PCIe 4.0 will not be able to deliver 300W from the PCIe slot

PCIe 4.0 will not be able to deliver 300W from the PCIe slot

PCIe 4.0 may increase the power delivery specification to 300W

PCIe 4.0 will not be able to deliver 300W from the PCIe slot


Earlier in the week reports from Tom's Hardware stated that PCI-SIG, the group behind the PCIe specification, were planning to increase the power limit for PCIe 4.0 expansion cards to "a minimum of 300W" from 75W. Now this information has been confirmed to be incorrect, as slot power will remain limited to 75W for PCIe 4.0 and total power draw for components may be allowed to exceed 300W. 

This means that PCIe 4.0 devices will have the similar power limitations to before, requiring auxiliary power connections in order to use more than 75W. 

PCIe 4.0 will offer 2x the bandwidth of existing PCIe 3.0, offering 16GT/s rather than 8GT/s. This effectively allows PCIe 4.0 devices to offer the same bandwidth as PCIe 3.0 with half of the PCIe lanes and offer double the PCIe bandwidth for PCIe 4.0 x16 devices like future GPUs and other PCIe solutions.  



PCIe 4.0 devices are being shown off at IDF 2016


Right now it looks like the PCIe 4.0 specification will be finalised later this year, meaning that it is unlikely to reach consumer motherboards for quite some time. 


You can join the discussion on PCIe 4.0 increasing PCIe power limits on the OC3D Forums


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