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New Pascal rumor/leak. It comes from Chiphell(in chinese), via bitsandchips.it (in italian) and wccftech so, as always, take it with all the necessary salt.

 

Nvidia Pascal GTX 1080 Features 8GB GDDR5X & 384GB/s Of Bandwidth, GTX 1070 Features 8GB GDDR5 & 256GB/s

http://wccftech.com/rumor-nvidia-pascal-gtx-1080-gddr5x-gtx-1070-f-gddr5/#ixzz45Y1uILsQ

According to the latest whispers Nvidia has allegedly designed two reference PCBs with GDDR5X and GDDR5 compatibility for its GP104 GPU based GTX 1080 and GTX 1070 graphics cards. The latest whispers claim that Nvidia has decided to create a “premium” GP104 board based on the GP104-400 GPU that is going to power the flagship Pascal GeForce GTX graphics card this year. Otherwise known as the GTX 1080 in the web’s echochambers, this “premium” board will allegedly feature GDDR5X rather than GDDR5.

Whilst Nvidia’s more mainstream GP104 based graphics card, the purported GTX 1070, will be based on a cut down version of the same GP104 chip code named GP104-200 and feature 8Gbps GDDR5 chips instead.

According to the same source two different PCB designs are necessary due to the different pin layout of GDDR5X and GDDR5 chips. So whilst the GP104 GPU is claimed to be compatible with both memory technologies, the different pin layout doesn’t allow GDDR5X to be a simple drop-in replacement.

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The first wave of GDDR5X memory chips will feature speeds that range from 10Gbps to 12Gbps. Which in turn means that the fastest GDDR5X configuration will yield up to 50% more bandwidth vs the 8Gbps GDDR5 memory chips pictured above. Because the GP104 GPU is configured with a 256bit memory interface, 12Gbps GDDR5X memory will deliver 384 GB/s of bandwidth. That’s 50% more compared to the GTX 980 and 14% more compared to the GTX 980 Ti.