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post #3436 of 6649
Thread Starter 
Quote:
Originally Posted by deadlylover View Post
 

 

Pay the $6 you cheap bastard. :p

 

I'd help, but I'm on the other side of the world.

And that's why I'm still here.

 

I'm a cheap bastard and would rather some guy with an unused bridge tell me otherwise.

 

I have all week to wait anyway

post #3437 of 6649
Quote:
Originally Posted by bowei006 View Post

And that's why I'm still here.

I'm a cheap bastard and would rather some guy with an unused bridge tell me otherwise.

I have all week to wait anyway
Shipping's probably only $1 off off NewEgg or Amazon, and they would ask you to pay that much for hopping anyway. (Ship the bridge in a large box.)
post #3438 of 6649
Thread Starter 
Quote:
Originally Posted by ibob4tacoz View Post


Shipping's probably only $1 off off NewEgg or Amazon, and they would ask you to pay that much for hopping anyway. (Ship the bridge in a large box.)

Ehh who knows

 

I can't believe I lost my old bridge still

post #3439 of 6649
Thread Starter 

Anyway, new post of mine. Help me out please.

 

I know what information to provide to you guys and have a good understanding of power and rails and stuff like that in terms of how they work and in generally what is safe. I'm unsure about some things so I'll be providing all the information needed. 

 

I just need help on if my PSU has the power in its rails and on the safety of using periph adapters for pcie connectors

 

Thanks guys


 

I am thinking of getting two AMD 7870 GHz Editions

I currently have this PSU
http://www.newegg.com/Product/Product.aspx?Item=N82E16817341018

 Is the Rails on the back of it

I have read the review for the CF 7870 and have noted the power consumption stated in that systems test as well as the AMD home page seen here:
http://www.amd.com/US/PRODUCTS/DESKTOP/GRAPHICS/7000/7870/Pages/radeon-7870.aspx#3
http://www.tweaktown.com/articles/4597/amd_radeon_hd_7870_2gb_reference_video_cards_in_crossfire/index16.html
http://www.tweaktown.com/articles/4597/amd_radeon_hd_7870_2gb_reference_video_cards_in_crossfire/index2.html

Notice that the 500W load is the total from the entire test setup from the two linked articles. It was stated that it was running on bare minimums but that is still a somewhat hefty test setup.

I also note that the 7870 requires two six pin power connectors. My PSU only has two and I need for. I am not using most of the extra peripheral connectors on my PSU.

I know most if not all the information I need to provide to you guys. I just don't know how to interpret the amps and rails on the PSU and on the safety of using an adapter that changes periph connect to 6pin connector.

So yeah, is using an adapter for the second cards power connectors safe and does my PSU have enough power on its rails for both the cards?


My computer will be changed and re-updated for this setup and will feature
AMD Phenom II X4 965 Be (Stock Clock)
Corsair H50 Liquid AIO (two 12cm fans)
128GB SSD
Two physical hard drives (non green drives)
One or Two 12cm case fans (no led)
Disk Drive

I used to use an APC UPS with power monitor with my computer and I got an estimate of my computer (with much more fans w/ leds and more HDD's) of 150W idle and 220W Load. This was with my old 5770 as well. Just for more information for you power crunching guru's.

post #3440 of 6649
Thread Starter 

http://www.tomshardware.com/forum/329264-28-good-crossfire

http://hardforum.com/showthread.php?t=1730623

 

First guy notes 39A on 12V rails. 

 

My PSU is multi rail(I read the OCN article on it) and so is the 25V on each rail then combined for 50V? If so I should be fine.

 

If that is true, then last question would be on using my molex to 6 pin or 8pin to 6 pin adapters and if there will be any problems with that.

post #3441 of 6649
Originally Posted by bowei006 View Post
 

If that is true, then last question would be on using my molex to 6 pin or 8pin to 6 pin adapters and if there will be any problems with that.

 

Pay attention to the rails for when you're plugging the cards in, the PCI express and the molex peripherals (for your 4 pin to 6 pin adapters) should be on different rails, just make sure that they are. If your power supply is modular, it might tell you what connectors are using which of the two 12V rails.

 

The TDP's for the 7870's are about 175W, two of them will run 350W and your CPU has a TDP of 140W, it might be cutting it a bit close, but I doubt you'll be able to draw that much power in normal heavy gaming use, and even if you're doing some crazy power heavy stress tests, I think you're juuuuust within the limit. I'd like to re-emphasise, those are worst case scenarios, you'd have to be deliberately go out of your way to draw as much power as you can by using cherry-picked stress tests and what not.

 

I'd worry about it when it becomes a problem. :p 

post #3442 of 6649
Quote:
Originally Posted by deadlylover View Post

Pay attention to the rails for when you're plugging the cards in, the PCI express and the molex peripherals (for your 4 pin to 6 pin adapters) should be on different rails, just make sure that they are. If your power supply is modular, it might tell you what connectors are using which of the two 12V rails.

The TDP's for the 7870's are about 175W, two of them will run 350W and your CPU has a TDP of 140W, it might be cutting it a bit close, but I doubt you'll be able to draw that much power in normal heavy gaming use, and even if you're doing some crazy power heavy stress tests, I think you're juuuuust within the limit. I'd like to re-emphasise, those are worst case scenarios, you'd have to be deliberately go out of your way to draw as much power as you can by using cherry-picked stress tests and what not.

I'd worry about it when it becomes a problem. tongue.gif  

Be careful. TDP is not necessarily the same as power consumption. It should equal power consumption under full load but typically is off. Try using extreme power supply calculator. It will give a reasonable estimate of your power usage.
post #3443 of 6649
Quote:
Originally Posted by bowei006 View Post
 

Anyway, new post of mine. Help me out please.

 

I know what information to provide to you guys and have a good understanding of power and rails and stuff like that in terms of how they work and in generally what is safe. I'm unsure about some things so I'll be providing all the information needed. 

 

I just need help on if my PSU has the power in its rails and on the safety of using periph adapters for pcie connectors

 

Thanks guys


 

I am thinking of getting two AMD 7870 GHz Editions

I currently have this PSU
http://www.newegg.com/Product/Product.aspx?Item=N82E16817341018

 Is the Rails on the back of it

I have read the review for the CF 7870 and have noted the power consumption stated in that systems test as well as the AMD home page seen here:
http://www.amd.com/US/PRODUCTS/DESKTOP/GRAPHICS/7000/7870/Pages/radeon-7870.aspx#3
http://www.tweaktown.com/articles/4597/amd_radeon_hd_7870_2gb_reference_video_cards_in_crossfire/index16.html
http://www.tweaktown.com/articles/4597/amd_radeon_hd_7870_2gb_reference_video_cards_in_crossfire/index2.html

Notice that the 500W load is the total from the entire test setup from the two linked articles. It was stated that it was running on bare minimums but that is still a somewhat hefty test setup.

I also note that the 7870 requires two six pin power connectors. My PSU only has two and I need for. I am not using most of the extra peripheral connectors on my PSU.

I know most if not all the information I need to provide to you guys. I just don't know how to interpret the amps and rails on the PSU and on the safety of using an adapter that changes periph connect to 6pin connector.

So yeah, is using an adapter for the second cards power connectors safe and does my PSU have enough power on its rails for both the cards?


My computer will be changed and re-updated for this setup and will feature
AMD Phenom II X4 965 Be (Stock Clock)
Corsair H50 Liquid AIO (two 12cm fans)
128GB SSD
Two physical hard drives (non green drives)
One or Two 12cm case fans (no led)
Disk Drive

I used to use an APC UPS with power monitor with my computer and I got an estimate of my computer (with much more fans w/ leds and more HDD's) of 150W idle and 220W Load. This was with my old 5770 as well. Just for more information for you power crunching guru's.

This schiit is why I buy single rail PSUs

 

Though, Deadly is right, high load on the bigger rail, low load on the smaller one.

post #3444 of 6649
Quote:
Originally Posted by Tangster View Post
 

This schiit is why I buy single rail PSUs

 

Though, Deadly is right, high load on the bigger rail, low load on the smaller one.

LOL

 

 

Run furmark/prime95 and make sure that the PSU isn't being strained...

I don't know OCZ's reputation when it comes to PSUs, but shouldn't be anything like Diablotek haha.

 

Should hear some whines and buzzing if you're skating on thin ice.

 

My PSU is about to turn 7 in a few months lol.


Edited by Yazen - 11/24/13 at 9:33am
post #3445 of 6649

*


Edited by Yazen - 11/24/13 at 9:33am
post #3446 of 6649
Thread Starter 

My PSU isn't rated by reviews as too good in terms of it being enthusiast. 

 

Reviews had the crossfire cards at 300W total under load.

 

One card under load is approx 20A.

 

Is PCIE the only cable that leads to the 12V rail? What else goes to them?

post #3447 of 6649
Thread Starter 

Is there any difference in using the 3V or 5V line for my GPU through the adapter as opposed to the 12V?

 

 

 

My modular section all says V2 so I'm guessing that is using my 12V(2) while 12V(1) is used in the non modular section. I'm guessing that means that I can have thus one GPU plugged into 12V(1) with one of the cables that are left from the PSU's non modular part and then connect GPU2 with 12V(2)

post #3448 of 6649
 
Originally Posted by bowei006 View Post
 

Is there any difference in using the 3V or 5V line for my GPU through the adapter as opposed to the 12V?

 

My modular section all says V2 so I'm guessing that is using my 12V(2) while 12V(1) is used in the non modular section. I'm guessing that means that I can have thus one GPU plugged into 12V(1) with one of the cables that are left from the PSU's non modular part and then connect GPU2 with 12V(2)

 

Yeah, you'll want to be using the red connectors if possible to plug in your second GPU. This is because they are all 12V pins, which will share the current load across the three of them.

 

There's only one 12V conductor on the other modular connections, and that might be a problem if you try and power a whole GPU from one of them, as the cable may exceed it's rated current capacity. If you have to use the 4-pin molex converter thingies, use 1 plug from each separate modular connector breakout. It won't be an issue at all, but lets avoid shoving 12A down one single 18awg conductor of questionable quality in a hot PC case. :p 

post #3449 of 6649
Thread Starter 
Quote:
Originally Posted by deadlylover View Post
 

 

Yeah, you'll want to be using the red connectors if possible to plug in your second GPU. This is because they are all 12V pins, which will share the current load across the three of them.

 

There's only one 12V conductor on the other modular connections, and that might be a problem if you try and power a whole GPU from one of them, as the cable may exceed it's rated current capacity. If you have to use the 4-pin molex converter thingies, use 1 plug from each separate modular connector breakout. It won't be an issue at all, but lets avoid shoving 12A down one single 18awg conductor of questionable quality in a hot PC case. :p 

All of the modular 12V options seem to be tied to the 12V(2) which leads me to think that 12V(1) is the one that is non modular

 

So one GPU for each 12V rail?

post #3450 of 6649
 
Originally Posted by bowei006 View Post
 

All of the modular 12V options seem to be tied to the 12V(2) which leads me to think that 12V(1) is the one that is non modular

 

So one GPU for each 12V rail?

 

Yup, are there enough 6-pins on the hardwired cable for one GPU?

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