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Geforce GTX 780, 770 coming in May

You guys think I can run 2x GTX 780 with a 5yr old Corsair 750w PSU.
I've used the PSU calculator site & get quoted around 780w with my system.

Guess I'll have to upgrade my PSU if/when I get a second card.
 
K1LLER HORNET said:
You guys think I can run 2x GTX 780 with a 5yr old Corsair 750w PSU.
I've used the PSU calculator site & get quoted around 780w with my system.

Guess I'll have to upgrade my PSU if/when I get a second card.
Click to expand...

I would definitely upgrade psu,

I read about people pulling over 1000w with 2x titan.
 
IT Troll said:
Boost 2.0 was new to the Titan and will feature on the 780, not sure about the 770. It has the ability to adjust voltage and clock speed.
Click to expand...

Boost 2.0 feels like a sales gimmick to me, Titans seem to work the same as any other 6 series card. Don't let them get too hot and they will boost higher. I may be wrong but it does seem to work the same as any of the rest of the 6 series, the knack is to keep them cool.

Edit Also if the extra voltage is available when the card is within a set of temps, it is actually a fancy way of throttling the card when it gets too hot, rather than a performance boost.:D
 
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K1LLER HORNET said:
You guys think I can run 2x GTX 780 with a 5yr old Corsair 750w PSU.
I've used the PSU calculator site & get quoted around 780w with my system.

Guess I'll have to upgrade my PSU if/when I get a second card.
Click to expand...

Looking at your system spec that may be pusing it slightly as the PSU is 5 years old they do lose power over time. 12TB worth of HD's etc. as well as 2x780 and CPU 4.6ghz... Would probably work still but maybe get a new PSU to be safe and for any future upgrades etc.
 
pgi947 said:
Not bad at all then, a little guesswork with the figures we have vs what 670/680 differences were a 780 @ say 1050mhz must be easily around stock Titan perf?

Is boost 2.0 a new Titan/700 series thing that offers better clocks?
Click to expand...

It is a hard call Paul. With benching, I will give it +130 on the core, which should be around 1000Mhz but when you check with Precision X or AB, it is self boosting to 1050Mhz - 1100Mhz.

I don't like it and would prefer the option to switch it off and overclock like normal but you can see how it is a good thing for people who don't overclock. Nvidia took away the voltage control and now they are taking away the overclocking fun as well :(
 
Wasn't it possible on the 600 series to kill the boost in favour of a static 3d clock using nvinspector?

I wasn't a big fan of boost clocking on my 670. The card tried to decide what clock speed it should run for a certain amount of load and would give me the odd stutter doing so. As a low demand area would clock down to 800mhz which may lead to a high demand area that required the full 1350mhz. All problems that could have been avoided if it was a static clock.
 
Evga precision had a similar thing called k-boost where it would get rid of the boost. However from experience it would also lock the card from downclocking so you're always running at max speed.
 
Tonester0011 said:
Those people are probably playing Furmark and IBT....whilst using a SB-E processor :rolleyes:

He's got a 2600k overclocked modestly, yes....a 750w Corsair unit will be fine mate. Even if it is 5 years old.
Click to expand...

Agreed. A 750W will be plenty.

NirK said:
Looking at your system spec that may be pusing it slightly as the PSU is 5 years old they do lose power over time. 12TB worth of HD's etc. as well as 2x780 and CPU 4.6ghz... Would probably work still but maybe get a new PSU to be safe and for any future upgrades etc.
Click to expand...

I am far from smart when it comes to PSU's and I had never heard of PSU degradation but after looking into it, a few claim about 10% a year. I did some further digging with many sites claiming degradation as marketing and others as fact. Do we have any hard proof on this?

I see a lot of talk about "capacitor aging". It figures prominently in some of the PSU calculators. But I do not think it's as great a problem as "everybody" says it is.

Do capacitors age? Certainly. All electronic components (except perhaps inductors and transformers) age. One of the PSU calculators allows 10% a year PSU degradation under normal usage and 20% - 30% per year with 24/7 computer usage. This does not pass the "Does this make sense?" test to me.

I have a 7 or 8 year old 400 watt Antec power supply that apparently still works fine. Figuring 10% degradation a year, it should be able to produce only .90^7*400 or about 190 watts.

I have another system (recently pulled out of service) that I ran 24/7 except for when I was away on vacation. It ran for about 4 years on a cheapy 450 watt PSU. According to the PSU calculator, the PSU was producing around 180 - 190 watts when I pulled it out of service. I passed it on to a friend. It's still working in his system.

About 3 years ago, I dumped a working 10 year old P233 system (motherboard built long before the high reliability solid caps appeared on the market). It was running at 333 MHz (found an undocumented jumper setting).

I have a 25 year old Yamaha stereo amp (dead tuner) that still works well. Let's see:
.90^25 = .07% of original power.

My younger brother has a '71 or '72 vacuum tube (heat! and high voltage) guitar amp that except for tubes is original - well, the spring reverb unit doesn't work. Let's see:
.90^40 = .015% of original - really does not pass the "Does this make sense?" test.

Then there's all the 10 - 15 year old professional test equipment (mostly HP and Tektronix) in my maintenance shop.

I just do not worry about capacitor aging.
Click to expand...

I enjoyed that read but maybe because that says what I want it to say :p but it would be nice to have some factual proof.
 
pgi947 said:
Wasn't it possible on the 600 series to kill the boost in favour of a static 3d clock using nvinspector?

I wasn't a big fan of boost clocking on my 670. The card tried to decide what clock speed it should run for a certain amount of load and would give me the odd stutter doing so. As a low demand area would clock down to 800mhz which may lead to a high demand area that required the full 1350mhz. All problems that could have been avoided if it was a static clock.
Click to expand...

Jay85 said:
Evga precision had a similar thing called k-boost where it would get rid of the boost. However from experience it would also lock the card from downclocking so you're always running at max speed.
Click to expand...

Jay hit it on the nail. I use K-Boost for benching and it locks the clocks/volts at what you set but nobody wants full clocks/volts for desktop. The good thing with K-Boost now is, it can easily be switched on and off without a restart and works in SLI.

There may be another way of doing it but no one has come up with it yet.
 
At least it's possible then :)

As for psu degrading, if 10% a year then my hx1000 must be sub 500w by now :p it's old but refuses to die even with an sb-e chip at 1.48v and a pair of 7970's at 1.3v :D
 
There seems to be some people on this forum that have a mission to disagree with everything I say whether it is correct or false.... If you read my post I said "it probably will work ok but it would be worth upgrading to be safe as he has 12tb HDD's 4.6ghz and SLI 780's and it is 5 years old"

10% a year is doubtful but even if it has only aged ~12.5% in 5 years then it would be ~650w.... With all that stuff he has in his sig then it is a bit on the low side. As I said... it will probably work but would be good to upgrade to be safe and for future upgrades.
 
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NirK said:
There seems to be some people on this forum that have a mission to disagree with everything I say whether it is correct or false.... If you read my post I said "it probably will work ok but it would be worth upgrading to be safe as he has 12tb HDD's 4.6ghz and SLI 780's and it is 5 years old"

10% a year is doubtful but even if it has only aged ~12.5% in 5 years then it would be ~650w.... With all that stuff he has in his sig then it is a bit on the low side. As I said... it will probably work but would be good to upgrade to be safe and for future upgrades.
Click to expand...

I don't think anyone is disagreeing and I was asking if you knew of anywhere that had some form of proof or hard data showing how much the capacitors degrade in time. It was far from a dig and was a question (from me at least).
 
Ah ok then, I have not seen any exact figures but I have read that it depends on the quality of the capacitors... I don't think 10% a year is likely at all especially with good quality modern PSU. Probably 10-20% over 5 years is possible although Corsair is usually a good brand.
 
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