Do I need to plug in power cables into a second card?
Hi, I have a Sapphire HD 7850 Oced edition, and was looking to add the exact same card to xFire it. My question is, do I need to plug in the power connectors into the GPU? I'm not good at computers, although I understand the basics, and I'm not sure whether my PSU has the extra cables I need to plug it in. Can I buy these cables?
I don't know, but I'll post what I found on the website for my PSU, thanks for your help
Compliance with the newest Intel standard ATX 12V V2.31
More than 70% efficiency under typical load operation
High reliability (MTBF > 100,000 hrs)
Green power design to meet Energy Star and Blue Angel requirements
Silent operation with intelligent fan speed control
Multiple protection design (OVP/OPP/OCP/SCP)
Supports dual +12V1 and +12V2 outputs for higher power usage
Model: PS-650TM (Intel Form Factor ATX 12V V2.31)
Input Voltage: 230Vac (180 ~ 264Vac)
Input Current: 4A at 230Vac
Input Frequency: 47 ~ 63 Hz
PFC: Passive PFC
Cooling Fan: 120mm Fan
Efficiency: > 70% Typically
MTBF: > 100,000 hrs
Max Output Power: 650W
Dimension (W x H x L): 150 x 86 x 140mm
Weight (N/G): 2.8kg
20+4Pin Motherboard: 1
4+4Pin+12V CPU: 1
6+2Pin PCI-E: 2
4Pin IDE: 3
4Pin Floppy: 1
Protection: OVP / OCP / OPP / SCP
Approvals: CCC, CB, TUV, CE, C-Tick
Ok, say I open my computer, which isn't hard, where do I look for the 12V rail thing? I don't know what exactly to look for. Im pretty sure 650 W is enough for two 7850's.
And El Tigre the efficiency of my PSU is decent enough, and I've used their brand lots before and they are trustworthy. They even have their own Australian website, so that suits me even better.
As long as the PSU has these connectors for all cards (you will need 2 total for CF to work), then you should be able to run the cards. You will need 2 6 pin PCI-E power connectors pictured on the left. Some PSU's have the 6+2 PCI-E connectors, those will work as well pictured on the right. I highly not recommend running CF even if you use the Molex to PCI-E adapters because of the 70% efficiency is not good for CF setups and your PSU won't deliver the full watts rating at full load.
I just did some digging around and your PSU only pushes max 550W at load which WILL NOT be enough for CF HD 7850's to safely operate since the OC'ed cards require more juice. This site says it runs only 550W max.
According to this review of your card, it drinks around 218W at load per card, that's around 438W for both cards, with your CPU being 100W and your mobo, HDD's, fans, CD/DVD drives using power, you will blow out your PSU and maybe burn out your entire computer, with your current PSU, I Highly recommend you upgrade your PSU to a more dependable PSU brand such as Corsair if you want to CF your card. Your PSU is a no name cheapo unit.
The Corsair TX 750 750W can be found for about $100 and it's one of the best in it's class. It should be a similar price in your country. You will have plenty of power and more importantly, dependability.
uhm, sorry to bring up this thread so late, but just want to check what are your recommended PSU's to get.
Theres the TX 750,
then theres also this for $69
What do you recommend? The Asus one looks good, 80% efficiency, but I'm not sure how to check if It has the cables I need, also for the motherboard and stuff. Do you know how to check it.?