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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 1757

post #17561 of 38701
post #17562 of 38701
I'm looking at getting a pair of XFX 7950 Black Edition and upgrading them to watercooling. Can anybody tell what, if any, difference there is between the FX-795A-TDBC and FX-795A-TNBC other than the former having 2 fans (double dissipation, aka Double D Edition)?
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post #17563 of 38701
Quote:
I'm looking at getting a pair of XFX 7950 Black Edition and upgrading them to watercooling. Can anybody tell what, if any, difference there is between the FX-795A-TDBC and FX-795A-TNBC other than the former having 2 fans (double dissipation, aka Double D Edition)?

No difference other than the cooling solution. Keep in mind the Black Editions are "binned" better.

Having some issues with VDDC on my card. I think it might be power supply related. Currently have a 700watt Psu with 4x120mm fans, 1 220cm fan, 1 70mm fan. Amd 8120@ 4.9ghz (1.475 vcore) 8gb ram@2000, 2 Western Digital black 1tb drives in raid-0,SSD 120gb, ,Wireless networking card, Blu-ray Drive, Sound card.

VDDC is going up and down like spikes, and vdrop. Ranges between 1.006- and 1.1. Though it says it is only pulling 145-150amps on VDDC Current, and 15amp VDDC Current In. So Total Amps of 160. Puts me around 176 watts. For the GPU. Which seems a little low honestly. Wonder how much power is pulling from the PCI express. Because 2 6pin connectors cannot provide 176 watts. Only 150watts+ 150watts from the PCi express slot.

Not sure whats going on there, I did have a larger Power supply a few days ago, but the fan decided to stop working, so i had to swap in a different one i had laying around. Maybe its all in my head, the card is stable in windows while bitcoin mining. Which is the largest stress you can put on a video card really.
Edited by ebduncan - 11/3/12 at 5:44pm
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post #17564 of 38701
Quote:
Originally Posted by LoneWolf3574 View Post

I'm looking at getting a pair of XFX 7950 Black Edition and upgrading them to watercooling. Can anybody tell what, if any, difference there is between the FX-795A-TDBC and FX-795A-TNBC other than the former having 2 fans (double dissipation, aka Double D Edition)?

Unless I m missing something that TNBC is not a reference board. I would be very careful if you're looking to use EK and using their coolingconfigurator. A lot of the boards on there are not up to date and haven't kept up with the silent changes that have been made. If you're planning to use a universal GPU block then disregard.
post #17565 of 38701
Quote:
Originally Posted by dsmwookie View Post

Unless I m missing something that TNBC is not a reference board. I would be very careful if you're looking to use EK and using their coolingconfigurator. A lot of the boards on there are not up to date and haven't kept up with the silent changes that have been made. If you're planning to use a universal GPU block then disregard.

I'd assume that the first is a reference.. and the second isn't a reference PCB or it may/may not have a 7950 block. I'd have a look at your PCB itself and disassemble the cooler to see if it's reference.. And don't just check online photos actually check yours.
 
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post #17566 of 38701
Quote:
Originally Posted by Matt-Matt View Post

Quote:
Originally Posted by dsmwookie View Post

Unless I m missing something that TNBC is not a reference board. I would be very careful if you're looking to use EK and using their coolingconfigurator. A lot of the boards on there are not up to date and haven't kept up with the silent changes that have been made. If you're planning to use a universal GPU block then disregard.

I'd assume that the first is a reference.. and the second isn't a reference PCB or it may/may not have a 7950 block. I'd have a look at your PCB itself and disassemble the cooler to see if it's reference.. And don't just check online photos actually check yours.


XFX stopped selling true ref cards like back in May.
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post #17567 of 38701
Quote:
Originally Posted by tsm106 View Post

XFX stopped selling true ref cards like back in May.

Well there you go.. Look at some photos of the "old" single fan card and compare the PCB to your actual card. tongue.gif
 
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post #17568 of 38701

Spent the night doing some driver testing on my 7950 on Windows 8.

 

Default clocks at 925/1250

OC clocks at 1025/1450 +20% PowerTune

 

 

    12.8 + SDK 2.7 12.10 + SDK 2.7 12.11 + SDK 2.7 12.11 + SDK 2.7 OC
3dMark11 Overall 7043 7045 7602 8417
Graphics 7245 7261 7141 9460
Physics 6781 6767 6787 6749
Combined 6123 6070 5777 5782

 

Going from 12.8 to 12.10 yielded not much of a change, 12.10 to 12.11 on the other hand was a nice bump in performance.

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post #17569 of 38701
When I got my new HIS 7950, I got two different voltages options to change when testing to OC, but I don't know how I should think when I should change the MVDDC voltage ? redface.gif

The VDDC was my only option at my other 7950 I sent back redface.gif, what is the difference and when should I rise those voltages, I want a stable OC and not harm the card, hope someone can sort this out for me ! smile.gif

Using GPU-Z to monitor the values and HIS iTurbo for setting the OC if someone is wondering!
Edited by Macke93 - 11/4/12 at 9:41am
    
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post #17570 of 38701
MVDDC - memory VDDC
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