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7970 Lightning, worth the premium?

^Yep, Its not proven at all, if anything its slightly disproven. I've seen high ASIC 7970's fly under water (1360mhz+) and I've also seen low asic 7970's clock pretty high on air (1275mhz+).
 
It is slightly longer I think, around 12"

It's also slightly wider then a standard 7970 pcb.

Measure the backplate side if the card, that's how long the pcb is.
 
Damn it -

I can't hit 1200Mhz core (even with 1.3v) on mine...

I it safe to go as high as 1.35v (maximum in MSI Afterburner)?

Such a shame as the performance was really starting to fly at 1200mhz...
 
On water or air? Have you set pt to +20% and aux volts to +30mv?

1200 is very low for a lightning, 1.35v should be ok for a quick bench run with high fans on air, if on water then fire the volts right up :D
 
Thanks for the reply pgj947

Should have mentioned it is on water (EK full cover block).

PT is set to +20% and aux volts I do not know without checking (I will when I'm home from work) but I do not remember boosting that parameter.

Maximum volts on my MSI Afterburner is 1.35v - is there a way of getting access to higher?
 
hughythomas said:
Maximum volts on my MSI Afterburner is 1.35v - is there a way of getting access to higher?
Click to expand...

A reply I received from someone asking pretty much the same question:

"It's really hard to get above 1.36v and maintain it due to the power limits, aka OCP. If you push too far over the TDP limit, OCP will kick in and you BSOD. To get to 1.4v and up you'd have to do a hard mod to disable OCP/OVP."
 
You won't get higher voltage without afterburner extreme, to get that you need proof you are a seasoned clocker, have experience with sub zero and sign away your warranty ;)

Afaik ocp is completely disabled on the ln2 bios.
 
pgi947 said:
You won't get higher voltage without afterburner extreme, to get that you need proof you are a seasoned clocker, have experience with sub zero and sign away your warranty ;)

Afaik ocp is completely disabled on the ln2 bios.
Click to expand...

Sorry to venture off topic slightly.

How did you get on with my bios pgi? All good i take it. :cool:
 
Not quite mate, hit a cash flow problem so the cards on its way back to ocuk for refund :(

Will look into another card around xmas time, probably another lightning.
 
It's all good, I could probably have coped but I'd rather have a little cash buffer :)

Just means no gaming until the lightning is replaced.
 
Had another go clocking my Lightning this afternoon and managed to get the following

Core clock: 1220 MHz
Mem clock: 1775 MHz

Graphics score in 3D Mark 11 was 11966
 
I just got my lightning today and I went ahead and tried 1.25 V with a clock of 1200 MHz just to get things rolling. Will try to keep it at that voltage and see how high I can go.

Heaven @ 1200 MHz and stock Mem.

http://img825.imageshack.us/img825/8315/7970p.jpg

Temps reached 69'C on auto fan, with case fans set to low, through one run. Is that temp OK for 1.25 V on air?
 
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I just noticed that there is a voltage adjustment for memory? It's currently on 1600 mV, what is a safe setting this can go up to?

Btw I changed the fan profile and put the case fans on high and my max temp @ 1250mV core / 1600mV mem - 1260MHz clock / 1400MHz mem is 64'C

Will continue to see how much more I can raise the core frequency.
 
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