PetrolHead247
New member
His system listed above with 2 GTX 680's and a 2600K both with high overclocks would require just over 700W
Any advice on this build?
- Thread starter AndyMosh
- Start date
His system listed above with 2 GTX 680's and a 2600K both with high overclocks would require just over 700W
SEBAR
New member
I believe the GTX 680 power requirements are only marginally lower than the GTX 580. Most of the power supply calculators online have not updated to include the newer GTX 680. Using the power supply calculator on the ASUS web site I use the power power requirements of the GTX 580. http://support.asus.com/powersupply.aspx shows a recommended power supply of 950 watts.
PetrolHead247
New member
http://extreme.outer...culatorlite.jsp
Also this: http://www.techpower...680_SLI/21.html Techpowerup's SLI review shows a maximum power usage from both the 680's as being 437W
I also thought the power consumption was just a tad less than the 580 at first, but i later found out the 680 is a lot more efficient
SEBAR
New member
Wow, that is much lower than the wattage I saw, the recommended power supply is listed as 550 watts for a single card. Guru3d recommends a minimum 750 watts when running SLI (http://www.guru3d.com/article/geforce-gtx-680-review/9) but when you take into consideration the number of fans and peripherals running and the H100 you may be reaching the limit of an 850 watt power supply. Most likely you will never be stressing your system that far but I always like to have a little extra headroom.
Firat
New member
Fans, and other small peripherals don't use much wattage ....
The main wattage users in any system is going to be;
GPU & CPU and harddrives (if you have a lot)
The way I calculate what I need is.....
CPU = 95w
570 = 219w
Rest of components = ~ 100w
Overclockong both CPU & Gpu = + 150w
= ~ 570w load, and my system actually uses ~ 550w on load overclocked.
Gpu contribute a lot calculate it as I did using the wattage given by manufacturer.
Add ~ 20-30 extra for CPU overclocking (120w for me)
Add ~ 100w for single Gpu overclocking (based on my system)
He will be fine with a ax850w seen as people have used it in a system with an i7 and 2 * 580 overclocked!!!!
This psu can actually output ~ 900-1000w on maximum (although it is not rated for it)
Just shows the quality of the psu
SEBAR
New member
Good analysis.
Lauralarry
New member
just get the HX 750 dude these kids don't understand how it is to *Work* and really? they're both high end psu's fu*k the 7$ you save each year who cares enjoy yourself you live once the AX series is a waste 3 less modular cables and 80+ gold big deal.
- you only live once'
- you only live once'
PetrolHead247
New member
lul
Firat
New member
Erm sorry but i think your quite confused, this forum is a place of peace and none of it's members put people down just because of opinions, I was only giving the OP information from my experience since I have owned both of the products in question.
Please do not refer to me or others as "kids" if you knew math you would be able to calculate that this system would push the hx750 to its limits, the highest point of a PSUs efficiency is half of its rated output, if you want your components to last its best to follow people's experiences. If I draw 550w with a similar spec system with the only difference the Gpu (570) and only 1.
I'll leave you to ponder on the rest.
PS. You are 3 years younger than me as well.... How ironic.
Big WigglyStyle
New member
this has nothing to do with the 680 but I'm assuming the 680 uses less power than a 570 and with video proof I saw someone running two 570's under load on a 600w powersupply. Did he switch the labels and perfectly align them? maybe but why go through the trouble of doing that can't remember the cpu but it was sandy bridge I'm pretty sure. Regardless I think you will be fine with a 850w psu corsair psu's are very effiecient and often go above their rated output like Firat said
Also I've seen 4.6ghz claimed to be hit easily by the people doing it on the 3820. I don't think that Ivy will shock you too much I read an article saying ivy is suppose to be a worse overclocker than sandy
Also I've seen 4.6ghz claimed to be hit easily by the people doing it on the 3820. I don't think that Ivy will shock you too much I read an article saying ivy is suppose to be a worse overclocker than sandy
Firat
New member
[/font][/font]Power Consumption
[font=verdana, tahoma, sans-serif]Right, we installed the cards so let's have a look at how much power draw we measure with these graphics cards active and running.[/font]
[font=verdana, tahoma, sans-serif]The methodology: We have a device constantly monitoring the power draw from the PC. We simply stress the GPU, not the processor. The before and after wattage will tell us roughly how much power a graphics card is consuming under load.[/font]
[font=verdana, tahoma, sans-serif]Note: there has been a much discussion using FurMark as stress test to measure power load. Furmark is so hard on the GPU that it does not represent an objective power draw compared to really hefty gaming. If we take a very-harsh-on-the-GPU gaming title, then measure power consumption and then compare the very same with Furmark, the power consumption can be 50 to 100W higher on a high-end graphics card solely because of FurMark.[/font]
[font=verdana, tahoma, sans-serif]We decided to move away from Furmark in early 2011 and are now using a game like application which stresses the GPU 100% yet is much more representable of power consumption and heat levels coming from the GPU. We however are not disclosing which application that is as we do not want AMD/ATI/NVIDIA to 'optimize & monitor' our stress test whatsoever, for our objective reasons of course.[/font]
[font=verdana, tahoma, sans-serif]Our test system is based on a power hungry Core i7 965 / X58 system. This setup is overclocked to 3.75 GHz. Next to that we have energy saving functions disabled for this motherboard and processor (to ensure consistent benchmark results). On average we are using roughly 50 to 100 Watts more than a standard PC due to higher CPU clock settings, water-cooling, additional cold cathode lights etc.[/font]
[font=verdana, tahoma, sans-serif]We'll be calculating the GPU power consumption here, not the total PC power consumption.[/font]
[font=verdana, tahoma, sans-serif]Measured power consumption one card[/font]
- System in IDLE = 144W
- System Wattage with GPU in FULL Stress = 307W
- Difference (GPU load) = 163W
- Add average IDLE wattage ~10W
- Subjective obtained GPU power consumption = ~ 173 Watts
[font=verdana, tahoma, sans-serif]Measured power consumption two cards in SLI[/font]
- System in IDLE = 155W
- System Wattage with GPU in FULL Stress = 473W
- Difference (GPU load) = 318W
- Add average IDLE wattage ~20W
- Subjective obtained GPU power consumption = ~ 338 Watts
[font=verdana, tahoma, sans-serif]Mind you that the system wattage is measured at the wall socket side and there are other variables like PSU power efficiency. So this is a calculated value, albeit a very good one.[/font]
[font=verdana, tahoma, sans-serif][/font]
[font=verdana, tahoma, sans-serif][font=verdana, tahoma, sans-serif]Above, a chart of relative power consumption. Again, the Wattage shown is the card with the GPU(s) stressed 100%, showing only the peak GPU power draw, not the power consumption of the entire PC and not the average gaming power consumption.[/font][/font]
[font=verdana, tahoma, sans-serif][font=verdana, tahoma, sans-serif][font=verdana, tahoma, sans-serif]Here is Guru3D's power supply recommendation:[/font][/font][/font]
- [font=verdana, tahoma, sans-serif][font=verdana, tahoma, sans-serif]GeForce GTX 680 - On your average system the card requires you to have a 550 Watt power supply unit.[/font][/font]
- [font=verdana, tahoma, sans-serif][font=verdana, tahoma, sans-serif]GeForce GTX 680 SLI - On your average system the cards require you to have a 750 Watt power supply unit as minimum.[/font][/font]
[font=verdana, tahoma, sans-serif][font=verdana, tahoma, sans-serif][font=verdana, tahoma, sans-serif]If you are going to overclock the GPU or processor, then we do recommend you purchase something with some more stamina.[/font]
[font=verdana, tahoma, sans-serif]There are many good PSUs out there, please do have a look at our many PSU reviews as we have loads of recommended PSUs for you to check out in there. What would happen if your PSU can't cope with the load:[/font][/font][/font]
- [font=verdana, tahoma, sans-serif][font=verdana, tahoma, sans-serif]bad 3D performance[/font][/font]
- [font=verdana, tahoma, sans-serif][font=verdana, tahoma, sans-serif]crashing games[/font][/font]
- [font=verdana, tahoma, sans-serif][font=verdana, tahoma, sans-serif]spontaneous reset or imminent shutdown of the PC[/font][/font]
- [font=verdana, tahoma, sans-serif][font=verdana, tahoma, sans-serif]freezing during gameplay[/font][/font]
- [font=verdana, tahoma, sans-serif][font=verdana, tahoma, sans-serif]PSU overload can cause it to break down[/font][/font]
[font=verdana, tahoma, sans-serif][font=verdana, tahoma, sans-serif][font=verdana, tahoma, sans-serif]Let's move to the next page where we'll look into GPU heat levels and noise levels coming from these graphics cards.[/font]
[font=arial,helvetica,sans-serif]"GeForce GTX 680 SLI - On your average system the cards require you to have a 750 Watt power supply unit as minimum."[/font]
[font=arial,helvetica,sans-serif]Better safe than sorry.[/font]
[font=arial, helvetica, sans-serif]EDIT: The cards are not overclocked, so if the OP does OC, the minimum requirement would increase.[/font]
Absolutely agree with this. I had the HX750w as well and also traded mine in for the AX850w. The difference is huge! And like he said, the fan doesn't spin at all unless on very high load. The extra money spent is worth it and you can get that extra bit by going with the 2600K which is near identical to the 2700K. If you get a decent overclock you won't notice a difference.
I personally got my 2600K past 5.0Ghz.
Firat
New member
A good rule of thumb to follow when choosing a power supply is to pick a power supply that will allow the system to consume between 60 - 85% of the PSU power rating.
Here is a chart showing the optimal PSU to use based on the systems power requirements.
According to this chart, a system using 700w should get an 850w unit.
Firat
New member
Source : http://www.corsair.c...wer-supply.html
according to this, as i said before aim for 50% so in my case im close as 550w is about 60% of the AX850
Darklight1990
New member
One thing i would say is don't go for a Z77 board. i've been researching for my own rig and the Z77 chipset is designed primarily for Ivybridge, so while a Sandybridge cpu will work on the board you won't get the top performance out of the board or the cpu because the coding for Ivybridge and Sandybridge are very different.
as a side note from what i've read i'd go for the 2600k over the 2700k and save the money because near as i can tell there's next to nothing lost in real world tasking and you can save the extra 30 - 40 quid for something else.
as a side note from what i've read i'd go for the 2600k over the 2700k and save the money because near as i can tell there's next to nothing lost in real world tasking and you can save the extra 30 - 40 quid for something else.
