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Title: 7990 vs R290 mining Post by: Jamievs on December 09, 2013, 12:34:05 PM Good day folks,
Since this board appears to be for alt-coin hardware too I figured I'd ask my questions here. I've done a lot of research and I think I just have a little too much information in my head right now to make a descision, so I figured I'd ask here. I'm gonna build a scrypt rig (multiple GPU's) and with a good cpu for cpu mining. The choice comes down to what gpu to get. It will be a couple of 7990 or a couple of R290. 7990 shows a higher hashrate on some hardware comparison lists. Could I get some insight of people actually using those cards for mining? Are you happy with the rates and the temperatures? Looking forward to some input since it is a tough choice for me! Title: Re: 7990 vs R290 mining Post by: Jamievs on December 10, 2013, 09:23:03 AM Small bump since the post went to the gazillionth page already ;)
Title: Re: 7990 vs R290 mining Post by: sameev29 on December 10, 2013, 09:26:46 AM I am guessing a 7990 itself will give higher hash rate than R9 290 or R9 290X.Although it will cost you too.
Title: Re: 7990 vs R290 mining Post by: Charles999 on December 10, 2013, 09:35:50 AM 7990s. you wont' like the temperature. I constantly run above 90 c. can be tricky to keep it running. will burn a lot of boards.. gl
Title: Re: 7990 vs R290 mining Post by: Jamievs on December 10, 2013, 10:28:58 AM 7990s. you wont' like the temperature. I constantly run above 90 c. can be tricky to keep it running. will burn a lot of boards.. gl What board? And if I keep the case open? Or the case open and extra fans on it? @sameev29 Thanks. Height of investment is not relevant for now, ROI is ;) Title: Re: 7990 vs R290 mining Post by: Eastwind on December 10, 2013, 02:42:13 PM 7990s. you wont' like the temperature. I constantly run above 90 c. can be tricky to keep it running. will burn a lot of boards.. gl You need to undervolt the core with MSI afterburner beta. My setting with 1.0V, 950/1000MHz, it hashes at 1320kH/s. The temperature varies depending on the thermal paste of the cards. Title: Re: 7990 vs R290 mining Post by: Amph on December 10, 2013, 02:46:30 PM no sense to buy a 7990
280x = 750 kh/s - 275w 7990 = 1300 kh/s - 500w 7990 = about 70% faster - about 80% consumption = fail Title: Re: 7990 vs R290 mining Post by: kaito on December 10, 2013, 02:54:38 PM 7990s. you wont' like the temperature. I constantly run above 90 c. can be tricky to keep it running. will burn a lot of boards.. gl You need to undervolt the core with MSI afterburner beta. My setting with 1.0V, 950/1000MHz, it hashes at 1320kH/s. The temperature varies depending on the thermal paste of the cards. no sense to buy a 7990 That's not that bad. It saves you a PCIe slot too.280x = 750 kh/s - 275w 7990 = 1300 kh/s - 500w 7990 = about 70% faster - about 80% consumption = fail It only becomes terrible if you factor in the GPU costs. Title: Re: 7990 vs R290 mining Post by: Eastwind on December 10, 2013, 04:20:43 PM no sense to buy a 7990 280x = 750 kh/s - 275w 7990 = 1300 kh/s - 500w 7990 = about 70% faster - about 80% consumption = fail For me 7970 = 750 kh/s - 260w = 2.88 kH/s/W core/memory: 1.113/1.5V, 1065/1500MHz 7990 = 1300 kh/s - 400w = 3.25 kH/s/W core/memory: 1.0V, 950/1000MHz So 7990 is better. We can use 4x7990 but only 7x7970 on a MB. If we can undervolt the memory, it is even better. The temperature I get is from 65C to 92C depending on the position of the card and quality of the GPU and how the thermal paste was applied. Some times I have to undervolt to 0.96V so that it runs at 860/900MHz to keep temperature below 85C. I am thinking of reapplying the thermal paste, but not sure if it will void the warranty. Title: Re: 7990 vs R290 mining Post by: Amph on December 10, 2013, 04:22:17 PM maybe you was lucky with the 7990 and not lucky with the 7970, cuz the 7990 is around 450w at least
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