AMD 7790(GCN 1.1) - page 2. | Bitcointalksearch.org

chiropteran

sr. member

Activity: 348

Merit: 250

Quote from: Rjb82 on April 02, 2013, 05:55:00 PM

What card did you get?

What are stock settings? (core/mem/voltage)

Can you increase AND decrease voltage?

Sapphire 100356L
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202028

Stock Core 1000mhz Mem 1500Mhz, not sure about voltage, not showing properly in MSI afterburner. I suppose I should try the beta version, it may have support.

Edit-

With GPU Z,

ASIC Quality 66.5%
VDDC 1.231V
Current 81-89.9A
Power 96W (this is wrong, my total system power measured from the wall is only 120W, I know my CPU and other peripherals are using more than 24W)

44% fan speed 1900RPM

It confirms the overclock is working and core is at 1200mhz, and mem at 750mhz base. Interestingly it looks like the card periodically under-clocks the memory down to 150mhz, I guess it's a power saving feature to reduce power usage.

Rjb82

newbie

Activity: 57

Merit: 0

What card did you get?

What are stock settings? (core/mem/voltage)

Can you increase AND decrease voltage?

chiropteran

sr. member

Activity: 348

Merit: 250

Without changing anything else, increased clock speed to 1200mhz in msi afterburner, and getting 285MH/sec. Power usage increased to ~55W Temperature 60C

edit: with mem downclocked to 750mhz, power usage goes down 5W or so, and temp goes down 1-2C, while MH/sec remains about the same 285-290

chiropteran

sr. member

Activity: 348

Merit: 250

I got my 7790 today. It's the real deal, the numbers from tom's are legit.

This is pure stock just using the same settings I used on my old 5830 card, it's probably possible to increase significantly with optimizations and overclocking-

Note that cgminer didn't get close to these results, might be some bug involved or a setting I needed to use.

Power usage, measured from the wall, increases by about 38W while mining.

In my crowded Dell XPS 8500 case, it's running at a cool 58C at full load with no increased fan settings.

For comparison purposes, my old 5830 ran at 70C, did about the same or slightly less MH/sec (stock, I know I could have done more with overclocking), and used about 110W at full load. Next gen AMD cards are awesome miners, it's just too bad that the time of ASIC is almost upon us.

I'll do some additional testing and see how it does overclocked, since it's running so cool and using such little power I'd be shocked if I couldn't get some more hashing out of it.

FYI, initial test at mining litecoin was a total failure, seeing like 7kh/sec, obviously my configuration is all wrong but I'm not sure how to optimize it.

Gator-hex

hero member

Activity: 490

Merit: 500

Quote

when can we expect the 8 series to be out?

They delayed it until the end of 2013 / early 2014,

EU wasn't very happy about power consumption,

They won orders to produce 7850s for the PS4,

and I guess they have plenty 7xxx left to shift.

http://www.overclock.net/t/1358754/vc-amd-confirms-no-radeon-hd-8000-series-until-q4-2013

Milan77

full member

Activity: 202

Merit: 100

I place an order today for 4 pcs of these 7790. Will see tomorrow when they will ship.

Miner99er

sr. member

Activity: 310

Merit: 250

I was going to repleace my 5k cards with these, but then I found a deal on 7970's.

crazyates

legendary

Activity: 952

Merit: 1000

Quote from: Rjb82 on March 30, 2013, 12:56:09 PM

These are up for sale on newegg now. Anyone picked one up yet?

Do it! I want to see what these things can do.

They have fewer cores than the 7850, but are clocked higher. They should be about the same performance, but without any overclocking headroom, and $20 cheaper, right? They also have a narrower mem bandwidth, but higher mem clocks. Meh.

So really, and performance increase would be architecturally, right?

Rjb82

newbie

Activity: 57

Merit: 0

These are up for sale on newegg now. Anyone picked one up yet?

muqali

full member

Activity: 182

Merit: 100

Quote from: Miner99er on March 26, 2013, 09:57:06 PM

NO way in hell Bonaire will hit 400 MH/s... 360 is a possibility and that's with the noted 7.4% increase due to arch and pushing the core to 1300.

Yea, once AMD releases new drivers and OpenCL stuff that targets the improvements in the architecture the increases will come. I'm with you though, I don't think it'll be more than about 10% clock for clock. But apparently they did manage to do some slight tweaks to get power consumption down. I really want TSMC to get their asses in gear and get the node below 28nm up and running.

Miner99er

sr. member

Activity: 310

Merit: 250

NO way in hell Bonaire will hit 400 MH/s... 360 is a possibility and that's with the noted 7.4% increase due to arch and pushing the core to 1300.

-ck

legendary

Activity: 4088

Merit: 1631

Ruu \o/

The newer architectures based on GCN don't like vectors, so don't assume anything.

Crystallas

member

Activity: 109

Merit: 10

Quote from: crazyates on March 26, 2013, 12:29:36 AM

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

I'm thinking it's possible. But the real question is, how far will it OC? With those temps at load, and being the new Bonaire Pro chip, this card has some decent overhead. If 1200MHz on the core is all you can squeeze out, that would be what? Based on tomshardware, yeah, close to 400. He's getting 280 without -v on stock clocks. vectors switch and the right workload in theory would be around 310-340 Mh/s. If bonaire reacts as well as the architecture it was based on, the fastloop flags should eek out a little bit more. Then in theory again, the overclock could get you to/past 400. The temps are very nice on this card, so are the specs/price.

After all that is considered, just how durable would this card be under load? IMO, this looks promising.

And of course. I could be wrong myself. I have been burned by some bad/biased tomshardware reviews before, who knows if they didn't "phone in some of those benches". LOL

crazyates

legendary

Activity: 952

Merit: 1000

Quote from: Crystallas on March 25, 2013, 10:19:27 PM

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?

Crystallas

member

Activity: 109

Merit: 10

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.

muqali

full member

Activity: 182

Merit: 100

Quote from: FreedomCoin on March 23, 2013, 03:13:49 PM

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.

FreedomCoin

hero member

Activity: 675

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Freedom to choose

when can we expect the 8 series to be out?

Gator-hex

hero member

Activity: 490

Merit: 500

Quote from: crazyates on March 22, 2013, 10:54:03 PM

Quote from: Gator-hex on March 22, 2013, 09:37:28 PM

Quote from: crazyates on March 22, 2013, 02:44:59 PM

Quote from: Gator-hex on March 22, 2013, 11:50:41 AM

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.

MaGNeT

legendary

Activity: 1526

Merit: 1002

Waves | 3PHMaGNeTJfqFfD4xuctgKdoxLX188QM8na

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

muqali

full member

Activity: 182

Merit: 100

Quote from: Mik on March 23, 2013, 02:54:06 AM

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.

Topic: AMD 7790(GCN 1.1) - page 2. (Read 15141 times)