Are you sure its optimized? I cant compare the gpu performance but when it comes to cpu, poclbm-skc hashes around 50% slower than skeincoin-cpuminer on the same cpu. I dont have much time right now, but I can compare it tomorrow.
Maybe we can create some kind of a benchmark to see the performance of particular gpus?
In my case its:
7950 - 180MH/s
r9 280x 200MH/s
Overclocking can get you another 5-10MH/s
Edit:
| Model | Freq [MHz] | Hashrate [MH/s] |
| Core 2 Duo T9600 | 2800 | 1.4 |
| Intel i5 3317U | 2400 | 1.395 |
| Intel i7 3770k | 4500 | 5.3 |
| Intel HD4600 | ? | 6 |
| 8670D (A10-6800K) | ? | 30 |
| 5870 | ? | 110 |
| 5870 | 850 | 95 |
| 6930 | 860 | 93 |
| 6950 | 900 | 103 |
| 7870 | 880 | 94 |
| 7870 | 1150 | 140 |
| 7950 | 1100 | 184 |
| 7950 | ? | 193 |
| 7970 | 1170 | 220 |
| 280x | 1100 | 207 |
| 280x | 1030 | 201 |