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Well i mean the if you are to upgrade just the GPU why would you need a new PSU, as far as i read you got a 700W PSU in the box which should suffice the hunger of an GTX 1080.
I for my self upgraded the GPU last year, from a 780 to an 980TI without replacing any other components. The new graphics cards do need less power for their output.
And Btw. i would not try to SLI 2 different Cards, SLI was designed to produce "double" the output if you have 2 cards of the same type. (Interfaces and reasons and stuff is limiting the have a 690 and a 1080 in your pc) I once talked with an GraphicsCard dealer at CBit and he mentioned that it could work but it is not safe to work. Also, why bother with SLI? You get roughly 80%, maybe 90% of the full power since syncing between the cards takes some off (At least when i thought about doing SLI it was like that). So just go for a single 1080 and have sufficient graphics power for the next 3-4 years 
Rules for the FOSW ![ ^]
if(this.signature != "")
{
MessageBox.Show("This is my signature: " + Environment.NewLine + signature);
}
else
{
MessageBox.Show("404-Signature not found");
}
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The psu upgrade would be if I was to leave the both cards in. I think my current one is only a 700w.
I wasn't going to SLI the cards, but allow them to operate independent. If/when I pull the trigger, I'll see what happens, start with the 1 and take it from there.
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It sounds like you talked yourself into it already. 
I just had my main drive go out on me yesterday. The controller went bad.
I swapped the 1 from a backup drive to the main one that I had bought at the same time.
And it worked.
Now I have 2 new controller boards on the way.
I hope they work as is.
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You are asking if you should spend money on a new graphics card for your PC? You are asking the wrong bloke.
I'm typing this reply listening to an SACD of Dire Straights - Brothers In Arms, source is a DAC that cost £400, IEM's £1200. 
Go for it, you can't take it with you. 
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But if his wife hears how much he spent, she might ensure that he leaves it behind earlier than expected.
If you have an important point to make, don't try to be subtle or clever. Use a pile driver. Hit the point once. Then come back and hit it again. Then hit it a third time - a tremendous whack.
--Winston Churchill
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Thats a risk I agree, If my wife finds out I spent £1200 on a pair of IEM's then who knows. 
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She can make no comment, she just got a load of bling off me last month!
Anyway, a new gpu was on the list for crimbo!
modified 9-Mar-17 4:20am.
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55378008 wrote: You are asking if you should spend money on a new graphics card for your PC?
No, I'm not asking that........it is not about spending the money, I'll spend it anyway, just on other things!
55378008 wrote: Go for it, you can't take it with you.
Too true, and better me spend it that the misses! 
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In that case the funds should be allocated on the bases of performance improvement and usage.
How much do you use the PC and how much faster will the graphics actually be, will you notice the difference?
In my case usage of the DAC/IEM's is around 8 hours per day, but the sound quality difference of spending £1600 vs £600 is not so easily definable, £600 gets to probably 95% of the £1600 setup.
Did you compare benchmarks for the two graphics cards on similar systems to yours?
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Why would you want to use two GPUs (more precisely: three beacuse the GTX690 is a dual GPU card)?
The GTX1080 can drive four displays.
You will probably never use the old GPU anymore while still powered (a quick reseach shows that it consumes 108 W in idle mode).
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Suppose it depends what is being done. I believe there are still benefits to be had by offloading PhysX to a dedicated card and leave the GPU for rendering.
Also, if the machine was folding it would help.
Maybe should just go straight to dual gtx1080ti SLI and stop fannying about! Now there's an idea 
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DaveAuld wrote: Maybe should just go straight to dual gtx1080ti SLI and stop fannying about! Now there's an idea
You definitely earn too much money down there 
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No computer ever had enough processors, enough RAM, enough mass storage or enough graphics.
So: Yes, if you have a good use for it.
The language is JavaScript. that of Mordor, which I will not utter here
This is Javascript. If you put big wheels and a racing stripe on a golf cart, it's still a f***ing golf cart.
"I don't know, extraterrestrial?"
"You mean like from space?"
"No, from Canada."
If software development were a circus, we would all be the clowns.
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640kb ought to be enough for anyone.
* CALL APOGEE, SAY AARDWOLF
* GCS d--- s-/++ a- C++++ U+++ P- L- E-- W++ N++ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t++ 5? X R++ tv-- b+ DI+++ D++ G e++>+++ h--- ++>+++ y+++* Weapons extension: ma- k++ F+2 X
* Never pay more than 20 bucks for a computer game.
* I'm a puny punmaker.
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Seriously? I'm thinking about pumping up my poor old Elf II from 1978 from 4k to 8-16mb.
The language is JavaScript. that of Mordor, which I will not utter here
This is Javascript. If you put big wheels and a racing stripe on a golf cart, it's still a f***ing golf cart.
"I don't know, extraterrestrial?"
"You mean like from space?"
"No, from Canada."
If software development were a circus, we would all be the clowns.
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Woah, how would you manage it?
* CALL APOGEE, SAY AARDWOLF
* GCS d--- s-/++ a- C++++ U+++ P- L- E-- W++ N++ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t++ 5? X R++ tv-- b+ DI+++ D++ G e++>+++ h--- ++>+++ y+++* Weapons extension: ma- k++ F+2 X
* Never pay more than 20 bucks for a computer game.
* I'm a puny punmaker.
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Paging. I don't want to build a complete MMU, so the simplest way should be to use registers (latches, not CPU registers ) to extend the address bus by 8 more address bits and divide up the physical address space into several 16k banks. Each of those banks would have its own register, so that the processor can switch the page that is mapped into the 16k block can be selected by writing its address into the register.
The language is JavaScript. that of Mordor, which I will not utter here
This is Javascript. If you put big wheels and a racing stripe on a golf cart, it's still a f***ing golf cart.
"I don't know, extraterrestrial?"
"You mean like from space?"
"No, from Canada."
If software development were a circus, we would all be the clowns.
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Of course, I forgot that 1802 already has a 16 bit address bus (thought it had only 8 and was already paged) so it costs only a level of paging to upgrade it.
Two levels of paging would be a freaking lot to manage IMHO and I thought you had some more magic up to your sleeve 
* CALL APOGEE, SAY AARDWOLF
* GCS d--- s-/++ a- C++++ U+++ P- L- E-- W++ N++ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t++ 5? X R++ tv-- b+ DI+++ D++ G e++>+++ h--- ++>+++ y+++* Weapons extension: ma- k++ F+2 X
* Never pay more than 20 bucks for a computer game.
* I'm a puny punmaker.
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That's right the 1802 has only 8 address lines, but it multiplexes the 16 bit address on those address lines during its bus cycles. Just add another register and latch the upper half of the 16 bit address when the timing signal TPA is high. The 1802 was designed for compact small computers without the need of much discrete logic. That's why it has some features that are more like a microcontroller today and why it was used in many space probes, satellites and even the Space Shuttle. The need for address latch, however, always was a pain.
The language is JavaScript. that of Mordor, which I will not utter here
This is Javascript. If you put big wheels and a racing stripe on a golf cart, it's still a f***ing golf cart.
"I don't know, extraterrestrial?"
"You mean like from space?"
"No, from Canada."
If software development were a circus, we would all be the clowns.
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If it is your budget you should upgrade, because of the perfomance and better energy effiency (new chips with less heat). The old GPU you can sell (for instance on ebay).
I like the Asus "ti" series of nvidia because the have a higher performance 
Press F1 for help or google it.
Greetings from Germany
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I don't know what you use it for: if you need rendering for professional reasons then 1080 is the best chocie. I have a 1060 OC, it costs way less than the 1080 but it's astonishingly powerful and when (not if) you will have to upgrade it you will have a much lower sustained cost.
I game with it and it can run The Witcher 3 and Deus Ex: Mankind Divided at FullHD/Ultra graphics without a single stutter.
* CALL APOGEE, SAY AARDWOLF
* GCS d--- s-/++ a- C++++ U+++ P- L- E-- W++ N++ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t++ 5? X R++ tv-- b+ DI+++ D++ G e++>+++ h--- ++>+++ y+++* Weapons extension: ma- k++ F+2 X
* Never pay more than 20 bucks for a computer game.
* I'm a puny punmaker.
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Maybe find a used GTX690 and run with your old in sli? Cheap and might reduce rendering times.
http://www.game-debate.com/gpu/index.php?gid=3506&gid2=1547&compare=geforce-gtx-1080-ti-vs-geforce-gtx-690-sli
Consumes a bit of power thou.
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I analyzed every book ever mentioned on Stack Overflow. Here are the most popular ones.[^]
At the bottom of the post, he writes:
Right after I published {his website.com} I had a huge crowd checking out my web site. Apache couldn’t serve for more than 500 visitors at the same time, so I quickly set up Nginx and switched to it on the way. I was really surprised when real-time visitors shot up to 800 at same time.
I'm just thinking. Ability to handle concurrent clients- Doesn't it depend on the server hardware config & OS capabilities to the most part? Why should Apache "have" a limitation of 500+ requests.
I'm not sure I could be influenced by the Scale-up/out things of the cloud that we do today. But just 500 requests limitation for a well reputed server like Apache sounds wrong. May be he chose a mid-end h/w config for Apache.
Starting to think people post kid pics in their profiles because that was the last time they were cute - Jeremy.
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500 concurrent users and 500 concurrent requests are two different things.
You have just been Sharapova'd.
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