Rumor/Leak: Switch Hardware Specs, 1024 FLOP (Possibly 1TF) Device, Maxwell Architecture, Chat w/out Smartphone, Bluetooth Enabled...

[Pemalite]

dahuman said:

So, here is an interesting test, DX8 is FP16 and DX9 is FP32, see if you can spot the difference.

You kinda' do need to program your games to take advantage of the new abilities a new Direct X version offers.
Counter Strike has never been excessively demanding or leveraging a multitude of graphics effects anyway, performance is more vital for the competitive scene.