https://wccftech.com/intel-ice-lake-gen-11-graphics-15w-vs-25w-performance-comparison/

So we got an opportunity to try out Intel’s upcoming Ice Lake Gen 11 graphics and we noticed a convenient looking menu showing 15W and 25W TDP buttons. As you may know, Ice Lake will be shipping in 25W and 15W variants and here we had the opportunity to try out the effect of configurable TDP on a first hand basis. So we whipped out the camera and fired up the most easily accessible game: CS: GO.

The 15W configurable TDP is what is likely going to end up in very thing ultra books while the 25W option is going to end up in notebooks. If this single data point from CS GO is to be believed then you are looking at roughly a 40% performance improvement over the 15W part. The tests were running on 1080p resolution on an async panel and the game play was buttery smooth in both cases. Here is the average fps we saw during the session (both frames are the same):