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Author Topic: AMD 7790(GCN 1.1)  (Read 14879 times)
muqali
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March 22, 2013, 12:41:26 PM
 #1

I realize with the low CU count and whatnot it won't be a power card for mining, but does anyone who knows anything about the underlying microarch know if it'll up the compute performance at all? Anandtech just had an article on it, but it seems very similar to the old 7xxx series.

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chiropteran
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March 22, 2013, 03:00:35 PM
 #2

It's actually a very nice miner for it's expected price and power consumption.




If ASICs don't start taking over soon, 8 series Radeons are going to be really nice miners.

Gator-hex
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March 22, 2013, 03:50:41 PM
 #3

I suspect it will be running screaming hot, noisy and will have no headroom to overclock!

7790's 896 Stream processors is less than the 1024 stream processors in the 7850

It's the same price as a 7850, trust me get a 7850,

The chart is bullshit saying a 7850 does 232MH/s

Mine hash at..
80w 250MH/s reference 860/1200 clock.
100w 300MH/s stable 1050/1450 overclock with no volt mods.

add 100w for the system.

If they are really getting 250MH/s for 38w that would be amazing, but the specs say 85w!

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March 22, 2013, 04:37:25 PM
 #4

896 Stream processors is less than the 1024 stream processors in the 7850

It's the same price as a 7850, trust me get a 7850,

Agreed. The base clock of the 7850 is 860, but they seem to easily overclock up to 1000 or higher. I have one that does 1050 and another that does 1150.

At equal clocks (1000 core), the higher number of stream processors in the 7850 will result in a higher hash rate.

And if you want to switch to LTC at some point, a 2 GB 7850 will allow a higher thread concurrency, which will also result in a higher hash rate.

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March 22, 2013, 06:44:59 PM
 #5

Mine hash at..
80w 250MH/s reference 860/1200 clock.
100w 300MH/s stable 1050/1450 overclock with no volt mods.
Why would you OC your RAM to mine BTC?

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grue
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March 22, 2013, 07:17:41 PM
 #6

Mine hash at..
80w 250MH/s reference 860/1200 clock.
100w 300MH/s stable 1050/1450 overclock with no volt mods.
Why would you OC your RAM to mine BTC?
LTC :p

It is pitch black. You are likely to be eaten by a grue.

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March 22, 2013, 07:30:12 PM
 #7

Why would you OC your RAM to mine BTC?
LTC :p

I don't notice any difference in hashrate with memory at 1000 vs 1200, with cgminer... I haven't tested if it makes a difference with reaper, though. Can anyone confirm or deny?
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March 22, 2013, 08:33:54 PM
 #8

Mine hash at..
80w 250MH/s reference 860/1200 clock.
100w 300MH/s stable 1050/1450 overclock with no volt mods.
Why would you OC your RAM to mine BTC?
LTC :p
If he's getting 300MH/s @ 100W while mining LTC, I'll buy his card right now for 500BTC.

I don't notice any difference in hashrate with memory at 1000 vs 1200, with cgminer... I haven't tested if it makes a difference with reaper, though. Can anyone confirm or deny?
You talking LTC or BTC? While mining BTC, I notice very little difference in hashrate if I change the RAM speeds from 1500 to 950, or even down to 410. I DO notice much lower temps, however, and lower power draw.

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March 22, 2013, 09:03:07 PM
 #9

I don't notice any difference in hashrate with memory at 1000 vs 1200, with cgminer... I haven't tested if it makes a difference with reaper, though. Can anyone confirm or deny?
You talking LTC or BTC? While mining BTC, I notice very little difference in hashrate if I change the RAM speeds from 1500 to 950, or even down to 410. I DO notice much lower temps, however, and lower power draw.

I've only tried lowering memory down to 1000 from the default 1200 on my HD 7850. I haven't noticed any significant hash rate difference with either LTC or BTC at 1000 vs 1200, but I agree that there's a significant lowering of temperature and power draw at 1000 vs 1200.

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March 23, 2013, 01:37:28 AM
 #10

Mine hash at..
80w 250MH/s reference 860/1200 clock.
100w 300MH/s stable 1050/1450 overclock with no volt mods.
Why would you OC your RAM to mine BTC?

I see no power difference measured at the wall by underclocking the memory and as it's used for gaming, it's a hassel to keep changing it.  Wink

crazyates
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March 23, 2013, 02:54:03 AM
 #11

Mine hash at..
80w 250MH/s reference 860/1200 clock.
100w 300MH/s stable 1050/1450 overclock with no volt mods.
Why would you OC your RAM to mine BTC?
I see no power difference measured at the wall by underclocking the memory and as it's used for gaming, it's a hassel to keep changing it.  Wink
What about temps? I notice a -3C difference switching from 1500 to 950, and then another -2 or -3C going down to 410.

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Mik
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March 23, 2013, 06:54:06 AM
 #12

Hope you don't mind a newbie question here!  Wink
But does it still make sense to buy a Radeon 7850 for mining?
How long does it currently take for you guys to mine 1BTC with such a 7850?

Since I'm totally new to mining I run a test with my gforce at about 80Mhs and didn't make even 1 satoshi in days. So when I multiply times 3.5, which is about the performance of a 7850 (280Mhs), whats the gain? It still would take months to make 1BTC. Am I wrong?
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March 23, 2013, 08:56:09 AM
 #13

All the 5830's in my rigs are getting sold for this 7790 for BTC and LTC.

lower temps, lower wattage... overclock the core to get 300Mh/s BTC or 300Kh/s LTC... I like this!!!

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muqali
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March 23, 2013, 11:35:27 AM
 #14

Hope you don't mind a newbie question here!  Wink
But does it still make sense to buy a Radeon 7850 for mining?
How long does it currently take for you guys to mine 1BTC with such a 7850?

Since I'm totally new to mining I run a test with my gforce at about 80Mhs and didn't make even 1 satoshi in days. So when I multiply times 3.5, which is about the performance of a 7850 (280Mhs), whats the gain? It still would take months to make 1BTC. Am I wrong?


I get approx 0.1 BTC a day, but I also stop mining to game and whatnot at various time during the day. This is with an HD7970. I get another 0.01BTC or so from DVC/IXC/NMC merged mining I estimate. Depends on the exact rates on any given day.

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March 23, 2013, 12:06:35 PM
 #15

My old HD5870 are still doing very well for the costs.

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Gator-hex
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March 23, 2013, 01:02:46 PM
 #16

Mine hash at..
80w 250MH/s reference 860/1200 clock.
100w 300MH/s stable 1050/1450 overclock with no volt mods.
Why would you OC your RAM to mine BTC?
I see no power difference measured at the wall by underclocking the memory and as it's used for gaming, it's a hassel to keep changing it.  Wink
What about temps? I notice a -3C difference switching from 1500 to 950, and then another -2 or -3C going down to 410.

I think my OEM Sapphire 7850 2gb Dual-X are self power saving. They wouldn't work on AMD drivers, ran at half clock/mem speeds, only work correctly with Sapphires own drivers.

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March 23, 2013, 07:13:49 PM
 #17

when can we expect the 8 series to be out?

muqali
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March 26, 2013, 01:01:09 AM
 #18

when can we expect the 8 series to be out?

AMD screwed the pooch. As I understand it, the architectural changes that would have been 8xxx series are actually in the 7790. I'm not sure what they're doing or thinking. I would like to see something I can upgrade from my HD7970 to though. An 8970 would be the logical choice, but a 7975 with this "new" GCN1.1 would work too I guess. I game as much as mine, so any improvement is worthwhile to me.

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Crystallas
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March 26, 2013, 02:19:27 AM
 #19

tomshardware benchmarks look promising.

Especially when you factor in that he isn't running the optimal settings on that stock 7850. He should be getting ~300 Mh/s all day long with the standard -v -w128.

This is just pure speculation, but if you opt for the Sapphire 7790 OC(1075MHz from 1000MHz) and if other early reviews mean anything(hard capped OC at 1200MHz, still working under 70c load), this *could* be a 400+ Mh/s card... for 2.1BTC/$150 And running ~120 watt with those overclocks.


 Niiiice. 
crazyates
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March 26, 2013, 04:29:36 AM
 #20

tomshardware benchmarks look promising.

Especially when you factor in that he isn't running the optimal settings on that stock 7850. He should be getting ~300 Mh/s all day long with the standard -v -w128.

This is just pure speculation, but if you opt for the Sapphire 7790 OC(1075MHz from 1000MHz) and if other early reviews mean anything(hard capped OC at 1200MHz, still working under 70c load), this *could* be a 400+ Mh/s card... for 2.1BTC/$150 And running ~120 watt with those overclocks.

 Niiiice. 
You think the 7790 is capable of 400MH/s? Or did I read that wrong?

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