i want to buy some gpu for mining Zcash. . what is best ROI for mining this coin ? AMD rx 480 or 470?
I would say rx 480 4gb.. much more cheaper than the 8gb version (even cheaper than the 470 8gb, at least in my country).. almost similar performance in term mining zcash... in my case rx 480 consume less power than the 470..
here's the hashrate of my sapphire nitro rx 470 8gb & rx 480 4gb:
the gpu 0 = rx 470, gpu 1 = rx 480
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ZEC: Share accepted (329 ms)!
ZEC: 11/16/16-02:14:11 - SHARE FOUND - (GPU 1)
ZEC: Share accepted (312 ms)!
ZEC: 11/16/16-02:14:20 - New job from equihash.usa.nicehash.com:3357
ZEC - Total Speed: 307.922 H/s, Total Shares: 1435, Rejected: 3, Time: 01:04
ZEC: GPU0 152.638 H/s, GPU1 155.285 H/s
ZEC: 11/16/16-02:14:27 - New job from equihash.usa.nicehash.com:3357
ZEC - Total Speed: 307.292 H/s, Total Shares: 1435, Rejected: 3, Time: 01:04
ZEC: GPU0 152.107 H/s, GPU1 155.185 H/s
ZEC: 11/16/16-02:15:24 - New job from equihash.usa.nicehash.com:3357
ZEC - Total Speed: 306.654 H/s, Total Shares: 1442, Rejected: 3, Time: 01:05
ZEC: GPU0 151.656 H/s, GPU1 154.998 H/s
ZEC: 11/16/16-02:15:50 - New job from equihash.usa.nicehash.com:3357
ZEC - Total Speed: 308.496 H/s, Total Shares: 1449, Rejected: 3, Time: 01:05
ZEC: GPU0 152.233 H/s, GPU1 156.263 H/s
ZEC: 11/16/16-02:15:55 - SHARE FOUND - (GPU 0)
ZEC: 11/16/16-02:16:23 - New job from equihash.usa.nicehash.com:3357
ZEC - Total Speed: 310.850 H/s, Total Shares: 1459, Rejected: 3, Time: 01:06
ZEC: GPU0 153.520 H/s, GPU1 157.330 H/s
ZEC: 11/16/16-02:16:45 - New job from equihash.usa.nicehash.com:3357
ZEC - Total Speed: 312.392 H/s, Total Shares: 1461, Rejected: 3, Time: 01:06
ZEC: GPU0 154.383 H/s, GPU1 158.009 H/s
ZEC: 11/16/16-02:17:27 - New job from equihash.usa.nicehash.com:3357
ZEC - Total Speed: 312.066 H/s, Total Shares: 1466, Rejected: 3, Time: 01:07
ZEC: GPU0 154.624 H/s, GPU1 157.409 H/s
ZEC: 11/16/16-02:17:44 - SHARE FOUND - (GPU 0)
ZEC: Share accepted (328 ms)!
ZEC: 11/16/16-02:17:52 - SHARE FOUND - (GPU 1)
ZEC: Share accepted (329 ms)!
ZEC: 11/16/16-02:18:15 - New job from equihash.usa.nicehash.com:3357
ZEC - Total Speed: 310.241 H/s, Total Shares: 1477, Rejected: 3, Time: 01:08
ZEC: GPU0 154.255 H/s, GPU1 155.986 H/s
ZEC: 11/16/16-02:19:42 - New job from equihash.usa.nicehash.com:3357
ZEC - Total Speed: 306.195 H/s, Total Shares: 1488, Rejected: 3, Time: 01:09
ZEC: GPU0 151.096 H/s, GPU1 155.099 H/s
GPU #0: Ellesmere, 8192 MB available, 32 compute units
GPU #1: Ellesmere, 4096 MB available, 36 compute units
ZEC - Total Speed: 306.965 H/s, Total Shares: 1497, Rejected: 3, Time: 01:10
ZEC: GPU0 151.138 H/s, GPU1 155.827 H/s
Pool switches: ZEC - 0
Current ZEC pool share target: 0x001e1e1e (diff: 2176H)
ZEC: 11/16/16-02:21:05 - New job from equihash.usa.nicehash.com:3357
ZEC - Total Speed: 308.673 H/s, Total Shares: 1501, Rejected: 3, Time: 01:11
ZEC: GPU0 151.308 H/s, GPU1 157.366 H/s
ZEC: 11/16/16-02:23:05 - New job from equihash.usa.nicehash.com:3357
ZEC - Total Speed: 308.596 H/s, Total Shares: 1525, Rejected: 3, Time: 01:13
ZEC: GPU0 152.859 H/s, GPU1 155.737 H/s
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(I erased the "SHARE FOUND" list to make my post shorter)