Bitcoin Forum
December 09, 2016, 07:39:50 PM *
News: To be able to use the next phase of the beta forum software, please ensure that your email address is correct/functional.
 
   Home   Help Search Donate Login Register  
Pages: « 1 [2] 3 4 »  All
  Print  
Author Topic: 7970 from newegg $405  (Read 4946 times)
Mousepotato
Hero Member
*****
Offline Offline

Activity: 896


Seal Cub Clubbing Club


View Profile
April 25, 2012, 04:37:20 AM
 #21

VDDC: 0.9000 V
VDDC Current: 32.0-34.0 A

Mousepotato
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
1481312390
Hero Member
*
Offline Offline

Posts: 1481312390

View Profile Personal Message (Offline)

Ignore
1481312390
Reply with quote  #2

1481312390
Report to moderator
1481312390
Hero Member
*
Offline Offline

Posts: 1481312390

View Profile Personal Message (Offline)

Ignore
1481312390
Reply with quote  #2

1481312390
Report to moderator
1481312390
Hero Member
*
Offline Offline

Posts: 1481312390

View Profile Personal Message (Offline)

Ignore
1481312390
Reply with quote  #2

1481312390
Report to moderator
AzN1337c0d3r
Full Member
***
Offline Offline

Activity: 238

★YoBit.Net★ 350+ Coins Exchange & Dice


View Profile
April 25, 2012, 04:41:08 AM
 #22

VDDC: 0.9000 V
VDDC Current: 32.0-34.0 A

28W*2 for 550 MH/s?

That's 19 9.5 MH/J, which is FPGA efficiency. Are you sure that's not idle?

Mousepotato
Hero Member
*****
Offline Offline

Activity: 896


Seal Cub Clubbing Club


View Profile
April 25, 2012, 04:55:32 AM
 #23

VDDC: 0.9000 V
VDDC Current: 32.0-34.0 A

28W*2 for 550 MH/s?

That's 19 9.5 MH/J, which is FPGA efficiency. Are you sure that's not idle?

That's what it says on GPU-Z.  Actually, switching between cards (I didn't notice I could do that), I see some of the GPUs are at 37.5A.

Edit: And yeah, that's at roughly 277 MH/s per core.

Mousepotato
AzN1337c0d3r
Full Member
***
Offline Offline

Activity: 238

★YoBit.Net★ 350+ Coins Exchange & Dice


View Profile
April 25, 2012, 05:03:22 AM
 #24

That's what it says on GPU-Z.  Actually, switching between cards (I didn't notice I could do that), I see some of the GPUs are at 37.5A.

GPU-Z must be inaccurate then.

I did find this post by ArtForz:

https://bitcointalk.org/index.php?topic=60853.msg709254#msg709254

Quote
5970, linux amd64, cat 11.12, sdk2.5
cgminer @ 0.95V/600/150, 273W, 542Mh/s

7970, windows 7, cat 11.12 7970 edition, sdk 2.6
phoenix @ 0.92V/925/150, 217W, 535Mh/s

You seem to have a much lower undervoltage than he does, so maybe that's why your card matches 7970s in efficiency. ArtForz is showing 20% efficiency advantage to 7970.

Can't wait to see the 7990 efficiency numbers.

Dyaheon
Full Member
***
Offline Offline

Activity: 121


View Profile
April 25, 2012, 05:50:04 PM
 #25

I wouldn't trust GPU-Z numbers and not really sure about the idle numbers, although 7970 does have zerocore and low idle consumption otherwise too. However if running multiple monitors or unofficial overclocking, those idle features may not work. That 7.5MH/J number would be pretty awesome, but I doubt you're getting anywhere near that...

I think you have a dud card. All 3 of my 7970s can do significantly better than 1170 on stock. I can get 1220, 1230, and 1250 on all my stock voltage 7970s.


Yours are watercooled though right? That could make a big difference due to lower temps/power consumption. Or were those numbers on stock cooling?
Shadow383
Sr. Member
****
Offline Offline

Activity: 336


View Profile
April 25, 2012, 08:51:41 PM
 #26


^This is the settings I'm using right now on my gaming/mining PC - just the one 7970 in there right now but my aim for the summer is to get three more and go quad-crossfire and watercooled - the thought of spending £300 just on the extra waterblocks I'll need is a tad intimidating though  Grin
AzN1337c0d3r
Full Member
***
Offline Offline

Activity: 238

★YoBit.Net★ 350+ Coins Exchange & Dice


View Profile
April 25, 2012, 09:44:05 PM
 #27

I wouldn't trust GPU-Z numbers and not really sure about the idle numbers, although 7970 does have zerocore and low idle consumption otherwise too. However if running multiple monitors or unofficial overclocking, those idle features may not work. That 7.5MH/J number would be pretty awesome, but I doubt you're getting anywhere near that...
Yup I dont trust the GPU-Z numbers anymore. I guess I'll just have to rip out all my cards the next time I redo my loop and measure the no-graphics card wattage. Anyways my total system consumption is 1100 MH/s at 460W which is kind of impressive considering the list of hardware I'm powering in my sig.

Quote
Yours are watercooled though right? That could make a big difference due to lower temps/power consumption. Or were those numbers on stock cooling?
Yeah they are WC.

mdude77
Legendary
*
Offline Offline

Activity: 1358


View Profile
April 26, 2012, 09:52:02 AM
 #28

Even though newegg business and the normal newegg are not exactly the same (and sometimes even has different prices), you can still make an account on newegg business and shop like normal.

I looked at making an account.  I don't have a business.  I don't see how you could set one up without lying through your teeth.  It requires things like business day and federal tax id# (EIN).  Making that up is asking for trouble IMHO.

MMinerMonitor author, monitor/auto/schedule reboots/alerts/remote/MobileMiner for Ants and Spondoolies! Latest (5.2). MPoolMonitor author, monitor stats/workers for most pools, global BTC stats (current/nxt diff/USD val/hashrate/calc)! Latest (v4.2) 
Buyer beware of Bitmain hardware and services.
melmo
Full Member
***
Offline Offline

Activity: 213


View Profile
April 26, 2012, 01:58:49 PM
 #29

I digress. The advantage of 1.5 node gap in process should allow the 7970 to make a killing as far as efficiency goes. Could you post your GPU-Z VDDC and VDDC Current when mining on the 5970 @ 550 MH/s? Those 2 variables are the only things that can be comparable given our system's likely widely different configurations.

It looks like at higher frequencies the 7970 will win out in efficiency, but a 5970 putting out 550 MH/s is only running at about 500 MHz and 0.9 volts, so dynamic power usage must be at a sweet spot.  Static power use of a semiconductor due to current leakage rises exponentially as the thickness of the insulators decrease, so as dies shrink, static power use can account for over 50% of a chips overall power usage.

I guess you can't write off the 5970s as long as you don't mind underclocking and undervolting.

Anyways, that's my analysis but take it with a grain of salt - I am an electrical engineer, but not a good one Wink
ordy
Jr. Member
*
Offline Offline

Activity: 59


View Profile
April 26, 2012, 02:27:19 PM
 #30


i did grab 2 before the discount expired and they arrived today.  my first 7970's and any HIS card.  i am a bit leery of the state of the packaging (outer lame box tamper seal was not secure and the plastic 'coating' around the outer plastic shroud was not fully adhered) but will likely fire them up and see what happens........
Buckwheet
Member
**
Offline Offline

Activity: 108


View Profile
April 26, 2012, 02:36:06 PM
 #31


i did grab 2 before the discount expired and they arrived today.  my first 7970's and any HIS card.  i am a bit leery of the state of the packaging (outer lame box tamper seal was not secure and the plastic 'coating' around the outer plastic shroud was not fully adhered) but will likely fire them up and see what happens........

I ordered 12 of them. I will check mine out to see if there are any problems.
ordy
Jr. Member
*
Offline Offline

Activity: 59


View Profile
April 26, 2012, 04:34:16 PM
 #32


i did grab 2 before the discount expired and they arrived today.  my first 7970's and any HIS card.  i am a bit leery of the state of the packaging (outer lame box tamper seal was not secure and the plastic 'coating' around the outer plastic shroud was not fully adhered) but will likely fire them up and see what happens........

I ordered 12 of them. I will check mine out to see if there are any problems.

well, i decided to install one in my gaming rig and it does work - so that is good.  the highest stable clocks (with stock voltage) i can run on it are 1100/950 and it is pulling 656Mh/s with cgminer.  

i don't know enough about these cards right now to judge if that is within expectations or not, but i am suspicious that these could have been returns they just stuck back in inventory.
AzN1337c0d3r
Full Member
***
Offline Offline

Activity: 238

★YoBit.Net★ 350+ Coins Exchange & Dice


View Profile
April 26, 2012, 05:48:08 PM
 #33

It looks like at higher frequencies the 7970 will win out in efficiency, but a 5970 putting out 550 MH/s is only running at about 500 MHz and 0.9 volts, so dynamic power usage must be at a sweet spot.  Static power use of a semiconductor due to current leakage rises exponentially as the thickness of the insulators decrease, so as dies shrink, static power use can account for over 50% of a chips overall power usage.

I guess you can't write off the 5970s as long as you don't mind underclocking and undervolting.

Anyways, that's my analysis but take it with a grain of salt - I am an electrical engineer, but not a good one Wink

Not to say that your analysis is worth less than mine, but I have taken several graduate-level courses in semiconductor device physics and very-large-scale-integrated circuit design.


Just so that we are clear with our definitions:
Static power is the power consumed by a CMOS transistor when it is "static" (ie not going from 1 to 0 and 0 to 1). Dynamic power is the power used by a CMOS transistor when switching from 0 to 1 or 1 to 0.

There is no "sweet spot" in dynamic power usage when you look at it from a pure computational efficiency stand-point. Lower voltage (so less current leaks when you switch states) and lower frequency (less capacitive effect) is always more efficient (at least, until you reach the threshold voltage, then the device just stops working).

While it is true that static power consumption maybe lower on the 40 nm node, the lower threshold voltage on the 28nm node means that the transistor spends less time in the dynamic power usage. Engineers optimize static power usage and dynamic power usage using a variety of techniques, which is beyond the scope of this discussion. However, for a properly optimized process (ie. something a company would put out), the amount of energy (ie the sum of the static energy and dynamic energy) to do one unit work of computation always decreases as you shrink in process node (otherwise, there is little reason to shrink process nodes given modern ASIC's thermal-limitation).


Buckwheet
Member
**
Offline Offline

Activity: 108


View Profile
April 26, 2012, 07:12:24 PM
 #34


i did grab 2 before the discount expired and they arrived today.  my first 7970's and any HIS card.  i am a bit leery of the state of the packaging (outer lame box tamper seal was not secure and the plastic 'coating' around the outer plastic shroud was not fully adhered) but will likely fire them up and see what happens........

I ordered 12 of them. I will check mine out to see if there are any problems.

well, i decided to install one in my gaming rig and it does work - so that is good.  the highest stable clocks (with stock voltage) i can run on it are 1100/950 and it is pulling 656Mh/s with cgminer.  

i don't know enough about these cards right now to judge if that is within expectations or not, but i am suspicious that these could have been returns they just stuck back in inventory.

I got what I would call a "bad" batch of Black Edition XFX 7970s. They were only able to do 1100/950 stable as well. The normal black editions, for me, were much better. For ~$99 less I think you got a decent deal.
AzN1337c0d3r
Full Member
***
Offline Offline

Activity: 238

★YoBit.Net★ 350+ Coins Exchange & Dice


View Profile
April 26, 2012, 07:26:38 PM
 #35

From TSMC's website:

The 28nm high performance (HP) process is the first option to use high-k metal gate process technology. Featuring superior speed and performance, the 28HP process targets CPU, GPU, FPGA, PC, networking, and consumer electronics applications. The 28HP process supports a 45 percent speed improvement over the 40G process at the same leakage/gate.

7970: 4.5B transistors
5970: 4.3B transistors

So 7970 should be 45% faster (minus whatever overhead the scheduling hardware imparts on the architecture) at the same power levels.

DeathAndTaxes
Donator
Legendary
*
Offline Offline

Activity: 1218


Gerald Davis


View Profile
April 26, 2012, 07:30:45 PM
 #36

You really expect your 40nm GPU to actually even come close to a 28 nm GPU in terms of power efficiency? I mean yes we gained a bunch of scheduler hardware, but we're actually 1.5 nodes away from 40 nm (since TSMC cancelled their 32 nm node).

Of course. 

7000 series changed architectures and it is less favorable to mining.  Granted 7970 brute forces its way thought with higher clock & higher # of shaders but measured at the wall I haven't seen anyone "blow away" 5970s.

...

At least not yet.

4x5970
3.2 GH/s
1050W @ the wall.
~3.05 MH/J @ the wall.

The 7990 might change that.
AzN1337c0d3r
Full Member
***
Offline Offline

Activity: 238

★YoBit.Net★ 350+ Coins Exchange & Dice


View Profile
April 26, 2012, 07:35:46 PM
 #37

7000 series changed architectures and it is less favorable to mining.  Granted 7970 brute forces its way thought with higher clock & higher # of shaders but measured at the wall I haven't seen anyone "blow away" 5970s

I did find this post by ArtForz:

https://bitcointalk.org/index.php?topic=60853.msg709254#msg709254

...

ArtForz is showing 20% efficiency advantage to 7970.

You must have missed this then. Unless you consider 50W per card not a significant power savings.

Buckwheet
Member
**
Offline Offline

Activity: 108


View Profile
April 26, 2012, 07:37:55 PM
 #38

7000 series changed architectures and it is less favorable to mining.  Granted 7970 brute forces its way thought with higher clock & higher # of shaders but measured at the wall I haven't seen anyone "blow away" 5970s

I did find this post by ArtForz:

https://bitcointalk.org/index.php?topic=60853.msg709254#msg709254

...

ArtForz is showing 20% efficiency advantage to 7970.

You must have missed this then. Unless you consider 50W per card not a significant power savings.

I think the biggest problem with his post is that I have not been able to replicate his numbers fully on any of the 7970s I have bought. Without model information the post by itself, while helpful, does not show the whole picture.
AzN1337c0d3r
Full Member
***
Offline Offline

Activity: 238

★YoBit.Net★ 350+ Coins Exchange & Dice


View Profile
April 26, 2012, 07:42:59 PM
 #39

You really expect your 40nm GPU to actually even come close to a 28 nm GPU in terms of power efficiency? I mean yes we gained a bunch of scheduler hardware, but we're actually 1.5 nodes away from 40 nm (since TSMC cancelled their 32 nm node).

Of course.  

7000 series changed architectures and it is less favorable to mining.  Granted 7970 brute forces its way thought with higher clock & higher # of shaders but measured at the wall I haven't seen anyone "blow away" 5970s.

...

At least not yet.

4x5970
3.2 GH/s
1050W @ the wall.
~3.05 MH/J @ the wall.

The 7990 might change that.

It's not a dog. In fact SIMD is just VLIW with a scheduler slapped on top.

Talking about brute force, 3200 cores is not considered brute force? That's a >50% increase in the number of cores. Whereas the 7970 is clocked only 28% faster.

7000 series changed architectures and it is less favorable to mining.  Granted 7970 brute forces its way thought with higher clock & higher # of shaders but measured at the wall I haven't seen anyone "blow away" 5970s

I did find this post by ArtForz:

https://bitcointalk.org/index.php?topic=60853.msg709254#msg709254

...

ArtForz is showing 20% efficiency advantage to 7970.

You must have missed this then. Unless you consider 50W per card not a significant power savings.

Quote
I think the biggest problem with his post is that I have not been able to replicate his numbers fully on any of the 7970s I have bought. Without model information the post by itself, while helpful, does not show the whole picture.


They're 7970s? Pretty much all of them are reference? What information were you looking for?

You guys have convinced me to drain my loop and do no-card/single-card tests tonight.

DeathAndTaxes
Donator
Legendary
*
Offline Offline

Activity: 1218


Gerald Davis


View Profile
April 26, 2012, 07:49:18 PM
 #40

You must have missed this then. Unless you consider 50W per card not a significant power savings.

Where do you see 50W less per card at the same hashrate?

Code:
7970 phoenix @ 1.175V/1150/1070, 363W, 676Mh/s
5970 cgminer @ 1.05V/820/300, 377W, 761Mh/s

The 5970 & 7970 is roughly the same performance at high clock.  The 7970 has slightly higher efficiency at a modest undervolt but not this game changing nonsense you keep talking about.  Only at significantly lower clock/voltage the 7970 pulls ahead.  Of course at that significant of an undervolt the 7970 doesn't make much economical sense given FPGA still beat it in MH/W and underclocked it gives up a lot of MH/$.


Pages: « 1 [2] 3 4 »  All
  Print  
 
Jump to:  

Sponsored by , a Bitcoin-accepting VPN.
Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2006-2009, Simple Machines Valid XHTML 1.0! Valid CSS!