QuoteThe SQ1 processor also boasts of 3x more performance per watt compared to the 15W quad-core Intel Coffee Lake CPU found in the Surface Pro 6.
That's marketing speak for saying the GPU is 50% faster than the one in the 15W Whiskeylake(not Coffeelake because that's for 28W) chips.
They claimed the Icelake Surface Pro is 3x performance watt compared to Macbook Air, which is also graphics performance.