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CMPSU-TX650 and HD6950

S

stitreggin

Junior Member
Hello,

I have bought a CMPSU-TX650
HTML: 
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139005
and Gigabyte 6950
HTML: 
http://www.newegg.com/Product/Product.aspx?Item=N82E16814125372
as well an i5 2500k.

Will this PSU be more than powerful enough to run the i5 2500k and HD6950? And will this PSU have issues after overclocking the i5 2500k and HD6950?

Regards

Edit: How many years do you give this PSU when it will wear out?
 
It is more than powerful enough no matter how much you OC. 6950 = 160W, 2500K = 100W at stock speeds.

The PSU will last long, don't worry about it. Unless you're really stressing it close to its rated wattage, you should expect probably a decade of usable lifetime
 
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Way more wattage than you need...but IMO, that's not always a bad thing as long as it's not a 1000+ watt PSU for a single graphics card rig.

That PSU should last at least through the 5 year warranty...maybe even double that.
 
i thought it is the +12V rail at whatever amplitude that matters which delivers most of the power to the CPU and GPU. But why is it seems that you guys emphasize wattage over amps?? O_O
 
stitreggin said:
i thought it is the +12V rail at whatever amplitude that matters which delivers most of the power to the CPU and GPU. But why is it seems that you guys emphasize wattage over amps?? O_O
Click to expand...

You're right...for "modern computers," the numbers that matter the most are those for the +12 volt rail(s).
Total wattage is a combination of the watts (amps x volts) delivered to the +12 volt rail(s) the -12v rail, the +5v rail and the +3.3 volt rail.
The better quality power supplies will deliver around 90% of their rated power to the +12 volt rail(s) and the balance to the others...and will do it at 50 degrees C.

This guy can explain it better than I.
http://www.jonnyguru.com/forums/showthread.php?t=3264
 
Got my 650TX almost three years ago, still going strong. Video card isn't quite as powerful but my CPU definitely draws more, and I'd be comfortable putting a 6950 on this system.
 
If you look at this graphic:

34664.png


You'll see that the system power requirements for a computer (not overclocked) with a 6950 GPU is 320 watts running Furmark...which draws more GPU power than normal.
 
Yeah as you can see you could run 6950 crossfire at stock speeds with zero issues, you'd just need molex->PCIe power cable adapters (which is OK in a single-rail PSU).
 
Smartazz said:
What do you mean?
Click to expand...

If you have two +12V rails, then obviously some +12V cables will be connected to one rail, some to the other. Normally, you don't expect devices that are powered with a standard 4-pin molex connector to use a lot of power - e.g. fans, IDE drives, fan controllers, cold cathode lights, etc. So it's possible that the molex connectors are on a rail that doesn't have enough wattage overhead to handle a powerful graphics card like 6950. On a dual-rail 650W unit, that wouldn't be very likely since the rail with molex connectors would still be pretty powerful, but on a quad rail unit I would expect there to be problems when using adapters
 
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lehtv said:
If you have two +12V rails, then obviously some +12V cables will be connected to one rail, some to the other. Normally, you don't expect devices that are powered with a standard 4-pin molex connector to use a lot of power - e.g. fans, IDE drives, fan controllers, cold cathode lights, etc. So it's possible that the molex connectors are on a rail that doesn't have enough wattage overhead to handle a powerful graphics card like 6950. On a dual-rail 650W unit, that wouldn't be very likely since the rail with molex connectors would still be pretty powerful, but on a quad rail unit I would expect there to be problems when using adapters
Click to expand...

BUT, keep in mind, not all "multi-rail" PSU's are actually multi-rail units...

http://forums.anandtech.com/showthread.php?t=157583

Is it true that some PSU's that claim to be multiple +12V rails don't have the +12V rail split at all?

Yes, this is true. But it's the exception and not the norm. It's typically seen in Seasonic built units (like the Corsair HX and Antec True Power Trio.) It's actually cheaper to make a single +12V rail PSU because you forego all of the components used in splitting up and limiting each rail and this may be one reason some OEM's will not split the rails, but say they are split. Some system builders adhere very closely to ATX12V specification for liability reasons, so a company that wants to get that business but also save money and reduce R&D costs will often "fib" and say the PSU has it's +12V split when it does not.

Why don't those PSU companies get in trouble?

Because Intel actually lifted the split +12V rail requirement from spec, but they didn't actually "announce" it. They just changed the verbiage from "required" to "recommended" leaving system builders a bit confused as to what the specification really is.
Click to expand...
 
Okay, thanks for the info. So I assume that if I had no problems with instability or random shutdowns/restarts, then everything is fine? My Seasonic does get pretty hot under full load, but I think that's to be expected when it's probably supplying 300W+ for extended periods of time.
 
With a single 6870 at stock and 2500K @ 3.6, you're barely using 300W at full system load, less when gaming. With the 6870 OC'd, you're probably using around 300W in games... regardless, a 620W seasonic should handle 6870 crossfire without any issues. Probably around 450W when gaming with both cards OC'd.
 
lehtv said:
With a single 6870 at stock and 2500K @ 3.6, you're barely using 300W at full system load, less when gaming. With the 6870 OC'd, you're probably using around 300W in games... regardless, a 620W seasonic should handle 6870 crossfire without any issues. Probably around 450W when gaming with both cards OC'd.
Click to expand...

Sorry, didn't update my sig, but I have two GPUs now, the 6870 and an 8800GTS for Physx/DC. The 6870 has two PCI-e power connectors from the power supply and the 8800 has two molex connectors converted to a single PCI-e power connector. Should I switch these up so that the 8800 has a PCI-e power connector and the 6870 has 1 PCI-e power connector and two molex to PCI-e power connector?
 
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Well, in general when using adapters you should try to minimize the amount of power drawn via the adapters. Given that your second GPU is for PhysX, it's not going to be drawing as much power and as often as a PCIe connector on the main GPU - so I'd keep the adapter on the 8800GTS. However as you're powering only one PCIe power connector (max. 75W) with an adapter, and the rails in your PSU are quite powerful (25A or 300W per rail), it really shouldn't matter.
 
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