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Author Topic: Radeon HD 7950 - 1792 Stream Processing Units  (Read 16516 times)
monsterblitz
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January 31, 2012, 04:30:24 AM
 #1

added some specs:

Radeon HD 7950
3GB Memory, 384-bit GDDR5
Core Clock: 800MHz
Stream Processors: 1792 Stream Processing Units
Effective Memory Clock: 1250MHz (5.0Gbps)


http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007709+600290139&QksAutoSuggestion=&ShowDeactivatedMark=False&Configurator=&IsNodeId=1&Subcategory=48&description=&hisInDesc=&Ntk=&CFG=&SpeTabStoreType=&AdvancedSearch=1&srchInDesc=

Just caught these for sale at newegg.  Wish price was lower.  Anyone know how they preform?



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Keninishna
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January 31, 2012, 04:39:55 AM
 #2

hard to say as no one has them yet, but I imagine 20% less or so from the 7970s.
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January 31, 2012, 04:47:27 AM
 #3

hard to say as no one has them yet, but I imagine 20% less or so from the 7970s.

If they can not be unlocked, they should be able to do 90% of a 7970 with overclocking.  The fan systems are quite variable looking between those cards, and the reference fan design on the 7970 is hard to beat so clocked the same the 7950 could get hot. 

As normal, AMD is figured out a pretty comfortable spot to place its 'neutered' version of the XX70.

tritium
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January 31, 2012, 05:46:39 AM
 #4

apparently you can't unlock any extra shaders but flashing with a 7970 does give a small performace boost at the same clock rate

1FCzN34C1xCLsDaLxfY7yB5CQKN74ruGHV
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January 31, 2012, 06:18:18 AM
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5970's that are selling for $400 just got alot less attractive now...

I want to pull the trigger on a few of these but I told myself I'd stop buying so much hardware...
ummas
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January 31, 2012, 07:42:57 AM
 #6

For mining the best would be 1.5 GB - cheeper.
Unlocking possibility is verry importand.

It`s on stock in Poland, for only 585$+shipping - wolcome in Poland !
Maybe becouse it`s OC gigabyte with 900Mhz on core.
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January 31, 2012, 05:06:20 PM
 #7

So what was the price?

Mousepotato
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January 31, 2012, 07:09:13 PM
 #8

So what was the price?

MSRP is $450 USD.  A lot of the models are overclocked from the factory with bigger coolers and around $500.

As far as unlocking, AMD was adamant that it not be possible to unlock extra GPU units.  People have flashed the 7970 BIOS onto 7950 and it does not unlock anything. 
portron
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January 31, 2012, 07:38:12 PM
 #9

http://www.bit-tech.net/hardware/graphics/2012/01/31/amd-radeon-hd-7950-3gb-review/1

"Of course, there’s more to the HD 7950 3GB than the 12.5 per cent drop in stream processor count. AMD has also reduced the card’s stock speeds to match. While the HD 7970 3GB ships with a core frequency of 925MHz, the HD 7950 3GB’s core clock speed is only 800MHz, a 13.5 per cent reduction"



Gross, look at that middle fan Sad  I wonder how the VRM's and Caps will hold up with 24/7 mining and overclocking without them being covered like on the 7970....

Compare that to the 7970:




I guess we'll have to see what the price point for hte 1.5gb model will be:

"a lower price HD 7950 1.5GB will arrive soon to offer a cheaper alternative for those less concerned with ultra-high resolution or multi-monitor gaming. "

Edit: "Somewhere along the way a 1.5GB HD 7950 is also expected at the $399 price point."
http://vr-zone.com/articles/amd-radeon-hd-7000-series-roadmap-revealed/14693.html#ixzz1l4Bfi1Tv
bulanula
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January 31, 2012, 07:58:46 PM
 #10

Yes. Anybody got an estimate for how many MHash/s this can pull while OCed ?

ArtForz was a pro at that kind of stuff ...
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January 31, 2012, 08:23:37 PM
 #11

10-15% Less than a 7970
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January 31, 2012, 08:35:54 PM
 #12

Yes. Anybody got an estimate for how many MHash/s this can pull while OCed ?

ArtForz was a pro at that kind of stuff ...

The current trend is to clock for max efficiency instead of max hash rate.  Make up for the hash rate with moar GPUs Smiley

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bulanula
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January 31, 2012, 08:37:22 PM
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Yes. Anybody got an estimate for how many MHash/s this can pull while OCed ?

ArtForz was a pro at that kind of stuff ...

The current trend is to clock for max efficiency instead of max hash rate.  Make up for the hash rate with moar GPUs Smiley

I care about MH/$ and density. Efficiency : I am not very concerned about that.
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February 02, 2012, 07:26:00 PM
 #14

Let me guess...

One 7970 at 925 MHz with 2048 ProcessingUnits does 540 MHash/s (540/925)/2048

So ONE ProcessingUnit at 1 MHz will do 0,000285051 MHash/s

7950 has 1792 ProcessingUnit at 800 MHz.

So ONE 7950 will do 408,6486486 MHash/s at DEFAULT clocks.

Assuming 30% overclock... 531,2432432 MHash/s @ 1040 MHz
K.A.T
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February 02, 2012, 08:45:19 PM
 #15

Let me guess...

One 7970 at 925 MHz with 2048 ProcessingUnits does 540 MHash/s (540/925)/2048

So ONE ProcessingUnit at 1 MHz will do 0,000285051 MHash/s

7950 has 1792 ProcessingUnit at 800 MHz.

So ONE 7950 will do 408,6486486 MHash/s at DEFAULT clocks.

Assuming 30% overclock... 531,2432432 MHash/s @ 1040 MHz

Thanks alot. I hope someone will update the Bitcoin Wiki.....
monsterblitz
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February 03, 2012, 05:47:56 PM
 #16

The wiki currently lists a 7970 with 650MHash/s at 1100MHz.

The 7950 has 87.5% of its Processing Units which equates to 568.75MHash/s at the same core clock (MHz).

Is this calculation valid?

I know from reading website reviews they reported the 7950 is not built as strong as the 7970 (pcb,fan).  That could be a factor in getting the same core clock.

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film2240
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February 04, 2012, 10:29:19 AM
 #17

The wiki currently lists a 7970 with 650MHash/s at 1100MHz.

The 7950 has 87.5% of its Processing Units which equates to 568.75MHash/s at the same core clock (MHz).

Is this calculation valid?

I know from reading website reviews they reported the 7950 is not built as strong as the 7970 (pcb,fan).  That could be a factor in getting the same core clock.

I like what I'm seeing with those numbers. :-)
If this keeps up,I'd be happier is seeing what the HD7990 could do when released.You could get a 1GHash/s card in 1 slot at last I bet.Anyways back to the HD7950,this certainly looks like a large step up from my HD6950 which was shader unlocked and overclocked heavily (885MHZ core stable,320MHZ mem clock) which gives me 400MHash/s (is that good for my card or poor?)

At stock speeds with unlocked shaders the HD6950 does like 360MHash/s (I think,as the reading was taken last summer and I forget exactly what the setup was like then) for me. Is there a spec link for the HD7950 as I'd like to learn more about it? I wish I could trade up my card for a HD7950 (or HD7970 as I prefer better performance)

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