Added 1660 TI to speed table

[Emeraude]

Just tested it with a 1660 Ti and got way better results (about 4250-4320MH/s)

Output of glxinfo:

OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: GeForce GTX 1660 Ti/PCIe/SSE2
OpenGL core profile version string: 4.6.0 NVIDIA 440.82

And here is the full output of the scallion command with a 8 chars prefix after running it for about one minute:

WARNING: The runtime version supported by this application is unavailable.
Using default runtime: v4.0.30319
Cooking up some delicious scallions...
Using kernel optimized from file kernel.cl (Optimized4)
Using work group size 32
Compiling kernel... done.
Testing SHA1 hash...
CPU SHA-1: d3486ae9136e7856bc42212385ea797094475802
GPU SHA-1: d3486ae9136e7856bc42212385ea797094475802
Looks good!
LoopIteration:15551  HashCount:260902.49MH  Speed:4267.2MH/s  Runtime:00:01:01  Predicted:00:02:08  
Stopping the GPU and shutting down...

LoopIteration:15552  HashCount:260919.26MH  Speed:4267.2MH/s  Runtime:00:01:01  Predicted:00:02:08  init: 168ms / 1 (168ms, 5.95/s)
generate key: 3487ms / 256 (13.62ms, 73.42/s)
cpu precompute: 8ms / 256 (0.03ms, 32000/s)
total without init: 61146ms / 1 (61146ms, 0.02/s)
set buffers: 25ms / 15552 (0ms, 622080/s)
write buffers: 195ms / 15552 (0.01ms, 79753.85/s)
read results: 60359ms / 15552 (3.88ms, 257.66/s)
check results: 11ms / 15552 (0ms, 1413818.18/s)

4267.15 million hashes per second

Tests done using an up-to date Archlinux (as of 07 May 2020)