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The ancient question.. can my psu handle it, molex to pcie etc

post #1 of 2
Thread Starter 
OK I'll keep this as short as I can, I'll hit myself per request if necessary.

I'm still running an OCZ MODXSTREAM 700W (sig rig).
http://ocz.com/consumer/psu/modxstream-pro-500w-700w-power-supply/specifications

I got my hands on a 270X and was looking over this system to see if I can swap 1 5770 with this, it's been a long time since I've done anything to this computer because it's not my main anymore. I use this mainly for BOINC / GRIDCoin mining and its hard drives for my network of titanic storage hoarding (its a disease not a crime).

From my research a 270x only pulls at absolute max load maybe 30 more watts than a 5770. What I would like to do is pull out 1 5770 and replace it with a 270x so it now runs 1 270x + 1 5770

the first problem of course is that this PSU only comes with 1 6 pin and 1 6+2 pin pcie power. The 270X requires 2 6 pin and the 5770 requires 1 6 pin.

I would like to power the 270x directly through my PSUs pcie power and buy a 6 pin to 2 molex adapter to power the 5770 back up. I still have one of the modular cables completely unused which has two molex on it.

I'm fairly confident 700W is enough for a single 270x + 5770 am I wrong?
Will there be any issues with overloading on amperage?

I've also always avoided molex to pcie power but I guess its time to think about it or i'll have to buy another psu and have this 700W sitting around doing nothing.

This PC as of now has 3 hard drives (1 wd black, 1 wd blue, 1 wd green), 1 DVDRW, 5 120mm fans,1 200mm fan, 1 250mm, and a basic 3.5inch fan controller (no screen or fancy electronics). 2 of the fans were scythe ultra kaze 3000 but i replaced them with slipstreams, I also pulled out a pci-e sound blaster x-fi to knock back power draw, I don't use this pc for charging usb devices so its primarily basic keyboard + mouse and occasionally a wired xbox controller or flash drive. I do not intend to overclock either GPU but usually run the cpu with a modest overclock (Phenom 955 BE).

I tried to crunch the numbers and it seems like I should have no issues but the molex to pcie still leaves me a bit weary. I understand that its safer to just go with my gut and upgrade PSU but as is usually the case, this won't be a viable option until I have some extra cash.

Let me know what you guys think I should do.

EDIT: If upgrading PSU is the most feasible option, I would appreciate recommendation. If I have to upgrade I would like to keep it modular and clean, I'm an absolute nut with hiding wires I was very proud of this build because its absolutely spotless smile.gif
Edited by Serious_Don - 3/10/14 at 12:40pm
Dream Machine
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Dream Machine
(19 items)
 
HAF Baked
(17 items)
 
The Don
(13 items)
 
CPUMotherboardGraphicsRAM
FX 4350 Gigabyte 990FXA-UD3 Rev 4.0 XFX 7950 DD 8GB (2X4) G Skill Ripjaws X DDR3 1866 
Hard DriveHard DriveHard DriveOptical Drive
Corsair Forse LS SSD Samsung Spinpoint F3 Western Digital Black Asus 24x DVD-RW 
CoolingOSMonitorKeyboard
Xigmatek Dark Knight Win XP & Win7 64 Pro Asus VH236H Ancient Dell Mechanical 
PowerCaseMouseMouse Pad
EVGA SuperNOVA 750 B2  Cooler Master HAF 922 Corsair MX65 Gigabyte Ghost Extreme Accuracy 
CPUMotherboardGraphicsRAM
AMD FX 4100 GIGABYTE GA-78LMT-USB3 HD Radeon 5770 8 GB Kingston HyperX Blu 
Hard DriveHard DriveCoolingOS
Western Digital Caviar OCZ Vertex Hyper 212 Evo Ubuntu 
MonitorKeyboardPowerCase
Samsung 225BW Microsoft Sidewinder X6 EVGA 650 GQ Deepcool Dukase 
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Microsoft Intellimouse Optical 
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post #2 of 2
You should not keep that PSU its not very good to say the least

Cooler Master V series or XFX XTR are full modular options

Stay away from the Corsair RM series
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Seravee
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Intel Core I7 6850K Gigabyte X99 Ultra Gaming EVGA GTX 1080 FTW2 Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD60EZRX  WD Red WD80EFZX 8TB  Seagate Ironwolf Pro 10 TB 
Optical DriveCoolingCoolingOS
LG CH12NS30 x5 Noctua NF-A14 FLX Noctua NH-D15S Windows 7 64 Bit 
MonitorMonitorKeyboardPower
Asus PG279Q LG 49UH750V 4K LED TV Corsair Gaming Strafe RGB EVGA SuperNova G2 750 watt 
CaseMouseMouse PadAudio
Phanteks Enthoo Luxe Roccat Kone EMP Roccat Sense Metor Sennheiser HD 598 
AudioAudioAudioAudio
Onkyo TX NR646  Harman Kardon HKTS 60 Dali Opticon Vokal x2 Dali Opticon 2 
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x2 Dali Opticon 1 CableMod E series PSU cable set CableMod LED Strips 
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