Of course Linux benchmarks are relevant. What they will show is the potential waiting to be unlocked in the X1000 hardware, or at least they will more accurately show this potential as the Linux builds have been maturing for longer.
Anyone with half a brain understands that early software builds for new hardware platforms are not the most optimised. Early adopters buy for the hardware, with the promise that the software that runs on it will improve. There is no reason to suspect this pattern won't be repeated with the X1000 too, as OS4 is still in active development, and X1000 is the flagship system of this OS.
So, bring on the Linux benchmarks, let's get a better picture of what the X1000 can do.
Well, Linux benchmarks are making only little sense. They will show the theoretical potential of the X1000. But it would be as intelligent as to measure/demonstrate a dual cpu PowerMac G5 with Bluetooth, Flash, latest 3D Hardware expansion under OS X/Linux to get a measure how well a PowerMac performs when MorphOS is the target.
Compare what's there here and now and not the theory. In theory MorphOS can even run on an i7 or Power7, well it's not much uptimized yet, hence take linux benchmark to show the potential of that machine that will of course get full support in two more weeks. But better buy that i7 now - you can easily wait the two weeks after the purchase antil MorphOS will support it.
The X1000 is more than 1.5 years delayed already, how long should users wait again? Two more weeks?