Crossfire 7950 boost PSU questions

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WeakHobo

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Sep 28, 2013
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Hello everyone, I read many threads about it which say it'll be OK but i wanted to be sure for my rig:

My rig (2.5 year old except graphics card) is :
Case: CM 690 II advanced ( one 80 mm fan at bottom, one 140 mm front, two 140 mm on the upper )
MB:Asus p8p67pro
CPU: I5 2500k OC at 4.1 ghz vcore= 1.248 V , the cooler is a hyper 212+
HDD: 1 TO samsung spinpoint F3 @ 7200 rpm
Ram: 4x2 DDR3 at 1600 Mhz
Graphic card: two MSI 7950 twin froz 3 boost edition(got 7970 PCB, default voltage is 1.88V, clocks are at 960/1250)
Monitor(120 hz): LG W2363D
PSU: Corsair Tx 750W V2

1)I don't know how much wats my system is needing? i've read it should be 550 to 600w but i'm unsure because i never found the Wats required for the MSI twin froz 7950 BE

2)Would my rig be OK even at full load? (i don't benchmark but things happen and i dont want everything frying on a full load moment)

3) Whats the worst case? does the PSU gets damaged or damages components or does it just shut off the comp?
Is there room for me to add more fans ?
 
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ddbtkd456

ddbtkd456

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Sep 4, 2013
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Your system probably is only going to use about 400 watts (that's really giving, less then that probably). Also please refrain from swearing in these threads as there are people here (not me i swear like a sailor) that do get offended by them. Yes your wattage will be fine at a full load probably only consuming less then 400 watts. My system (100% load) only uses about 350 watts:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD FX-8350 4.0GHz 8-Core Processor (Purchased For $199.99)
CPU Cooler: NZXT Kraken X60 98.3 CFM Liquid CPU Cooler (Purchased For $109.99)
Motherboard: Asus SABERTOOTH 990FX R2.0 ATX AM3+ Motherboard (Purchased For $189.99)
Memory: Corsair Vengeance 16GB (2 x 8GB) DDR3-1866 Memory (Purchased For $164.99)
Storage: Kingston SSDNow V300 Series 120GB 2.5" Solid State Disk (Purchased For $79.99)
Storage: Samsung 840 Series 250GB 2.5" Solid State Disk (Purchased For $173.85)
Case: NZXT Switch 810 (Black) ATX Full Tower Case (Purchased For $145.56)
Case Fan: NZXT FN-140RB 62.5 CFM 140mm Fan (Purchased For $9.99)
Case Fan: NZXT FN-140RB 62.5 CFM 140mm Fan (Purchased For $9.99)
Case Fan: NZXT FN-140RB 62.5 CFM 140mm Fan (Purchased For $9.99)
Case Fan: NZXT FN-140RB 62.5 CFM 140mm Fan (Purchased For $9.99)
Case Fan: NZXT FN-140RB 62.5 CFM 140mm Fan (Purchased For $9.99)
Power Supply: XFX 850W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply (Purchased For $109.99)
Optical Drive: Asus DRW-24B3ST/BLK/G/AS DVD/CD Writer (Purchased For $22.99)
Operating System: Microsoft Windows 7 Ultimate SP1 (OEM) (64-bit) (Purchased For $0.00)
Other: NZXT Hue (Purchased For $28.99)
Other: NZXT Sentry 2 Fan Controller LCD Display (Purchased For $23.89)
Other: NZXT Sentry 2 Fan Controller LCD Display (Purchased For $23.89)
Other: Rosewill 45 Piece Tool Set (Purchased For $20.99)
Other: Monoprice 18-Inch SATA III 6.0 Gbps Cable with Locking Latch and 1 x 90-Degree Plug (x6) (Purchased For $16.08)
Other: USB 2.0 Internal Motherboard Extension Cable 20 Inches (Purchased For $4.25)
Other: Genius Hi-Fi Wood Speaker for Computers (SP-HF500A) (Purchased For $44.99)
Other: Anker® Gaming Mouse, 7 Programmable Buttons, up to 4000 DPI, 5 User Profiles (bound to specific games), Omron Micro Switches (Purchased For $21.99)
Other: Perixx PX-1100, Backlit Keyboard - Red/Blue/Purple Illuminated Keys - Gaming Style Sollid 3.5lbs Design - Rubber Painting Surface - 20 Million Key-press Lifecycle - Brightness Control Wheel - 6 Feet Long Cable - Adjustable Palm rest (Purchased For $39.99)
Other: 32" TV (Purchased For $0.00)
Other: NZXT IU01 Internal USB Expansion (Black) (Purchased For $19.44)
Other: Sapphire Radeon Vapor-X HD 7950 OC with Boost 3 GB DDR5 DL-DVI-I/SL-DVI-D/HDMI/DP PCI-Express Graphics Card 11196-09-40G (Purchased For $249.99)
Total: $1741.78
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-09-28 03:40 EDT-0400)

That said here is your fan layout:

Front: 140 x 25 mm Blue LED fan x 1 / 1200 RPM / 19 dBA

Rear: 120 mm fan x 1 / 1200 RPM / 17 dBA

Top: 140 x 25 mm fan x 1 / 1200 RPM / 19 dBA (supports 120 / 140 mm fan x 2)

Bottom: 120 mm fan x 2 (optional)

Left side: 120 / 140 mm fan x 2 (optional)

Right side: 80 x 15 mm x 1 (optional)

HDD cage: 120 mm fan x 1 (optional)

VGA holder: 80 x 15 mm fan x 1 (optional)

My suggestion though to you would be to drop the Evo if you are looking to keep your temperatures way down:

For dual 120 mm fans:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU Cooler: Corsair H100i 77.0 CFM Liquid CPU Cooler ($89.99 @ NCIX US)
Total: $89.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-09-28 03:53 EDT-0400)

For dual 140 mm fans:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU Cooler: NZXT Kraken X60 98.3 CFM Liquid CPU Cooler ($99.99 @ Microcenter)
Total: $99.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-09-28 03:52 EDT-0400)

My personal perferance would be the dual 140 mm but make sure your case supports them first, because 140 mm fans spin slower to move the same amount of air as the 120 mm, plus when push comes to shove they can move about 30% more air then dual 120 mm can.
 
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W

WeakHobo

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Sep 28, 2013
4
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10,510
Thank you for your answer , i also took out the swearing part(i'm new here so I didn't know )
I edited my original post to add my monitor( LG W2363D -120 HZ) , but i think the monitor draws power from the wall and nothing from the psu ?

My system has 2 7950 in crossfire while you only have one 7950 so let's put +250W(may be less) it'd do 650W max, would that be OK for the tx 750W V2 ? It says the max +12V charge is 60A - 720W (specs put for room at 50°C) but many people say it's necessary to have headroom or something.

Temperature wise i've only seen the cpu temp being a little too high but still decent , I would rather not remove the hyper 212+ by fear of damaging a component in the process and because i don't have much budget now

I originaly had an additional 140 mm fan on the side but had to remove it because the fact that the 7950 seem bigger than my old 6870s , i fear it may touch the graphic card. I tried looking online for fans with a dimension lower than the one i actually have (xigtmatek XLF-F1453 : http://pcpartpicker.com/part/xigmatek-case-fan-xlff1453 ) , but the site where i buy them says all chassis fan have a dimension of 25 mm
My case http://pcpartpicker.com/part/cooler-master-case-rc692akkn5 has these dimensions: 8.40" x 19.50" x 20.80"
And my graphic cards seems to be at: 10.28" x 4.37" x 1.5"

I'm also limited to only one 140 mm fan , as the hyper 212+ is way too big to add anything near it
On the other hand I could put a 80 mm fan on the right side of the case, it would probably lower the CPU temp, but I think i would have to unmount the motherboard(?) since i didn't see a right side panel
 
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ddbtkd456

ddbtkd456

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In that case (sorry i forgot about the crossfire), you would need at least a 600 watt power supply, and 800 watts if you triple cross-fired it, again that is being generous with power though, also my recommendation in that situation would be the following:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU Cooler: NZXT Kraken X40 98.3 CFM Liquid CPU Cooler ($99.99 @ Newegg)
Total: $99.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-09-28 04:39 EDT-0400)

Put that where your single 140 mm fan is, doesn't have to be on the exhaust fan (but it does work better there), but then at least you have a push pull to try and get some heat out of the case?

Which case are you using, and what price would you pay for a new case? Curious because I am pretty good at finding new cases for pretty good prices.
 
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WeakHobo

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Sep 28, 2013
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the CM 690 II advanced is what I use: http://pcpartpicker.com/part/cooler-master-case-rc692akkn5

I don't have much budget left and I always fear making errors or damaging components so I originaly had my computer mounted by professionals and only replaced the graphic cards and added a fan , so I think changing the case would be a bit too much for me

That said my current setup keeps the graphic cards at 72°C in full load which is very good for a crossfire so If I can just drop the temps of my cpu by like 5 degrees with fans costing 10-15$ I would be more than happy so what I would be looking for would be a fan with a lower dimension than this : http://pcpartpicker.com/part/xigmatek-case-fan-xlff1453 , which would then fit corretly between the side panel and the graphic card but i don't know if it's possible ( i don't have more than 20 $ budget left)

 
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ddbtkd456

ddbtkd456

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Sep 4, 2013
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As long as there is 1 mm after you measure out the 25 mm on the other side of your graphics card you should be more then fine, make sure there is at least 26 mm between your fan mount (without the fan installed) and the end of your graphics card.
 
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