Operating a 832W device with an 850W power supply?
Operating a 832W device with an 850W power supply?
i7 overclock tips:
Many users don't handle this correctly. If multipliers vary by core load, performance drops as the load increases. For instance:
4.9→ 1 core
4.8→ 2 core
4.7→ 3 core
4.6→ 4 core
The ideal method is to use Prime95 and check via Task Manager. Observe if CPU speed aligns with 4.9GHz (or a bit lower) or 4.6GHz (also slightly lower).
Lowering the top frequency/voltage and adjusting multipliers can yield:
4.7GHz - 1 core
4.7GHz - 2 core
4.6GHz - 3 core
4.6GHz - 4 core
Since I don't have Haswell, it might not be relevant, but it could still apply.
Adjusting carefully can help run cooler and maintain or improve performance, though heat output will vary with your setup.
Well, I somewhat agree with you tea urchin. If Hardwaresecrets had carried out the review mentioned earlier, I'd feel much more secure because Gabriel handles the units and understands where the safeguards activate and what not. Also, taking into account derating reduces its performance further. But it really comes down to the specific unit, and I'm not entirely confident the Jonnyguru assessment is ideal for these tight scenarios. And as I mentioned before, GPU overclocking plays a significant role.
tea urchin :
The strider is a great unit.
The problem with math geeks first answer is he points out its about 85% of the power supply absolute maximum limit.(as a high estimate)
85% Is not a 'safe zone' unless you do not mind the unit lasting months , not years.
The next problem is the power supply maximum wattage (850) is across all voltage rails, whilst your stated load will be mainly on the 12 volt rail.(700/what ever)
This will push the % of maximum even higher on that rail to the point of no headroom.
Inductive start up loads etc even with a strider unit will drag its life expectancy down.
This is why there is usually a 100 watt discrepancy in cross fire/ sli configuration power recommendations.
It is to keep the % headroom you are not really aware of with a single card.
http://silverstonetek.com/legacy.php?are...5F-G&tno=2
1) 950W peak
2) 840W for the 12V rail
3) 440W for basic 2xGTX780 system
4) 600W approx may be his maximum load with overclock, drives etc, perhaps spikes up to 700W but I'd be surprised
*I MADE A MISTAKE**
The "440W" is apparently just for the two 780's not the system. Sorry about that. That does make it a bit more of a problem.
Another site says just over 400W for overclocking a single 780 so apparently add another 230W + 100W for CPU overclock/other and we're estimaging:
730W?
So, sorry, yeah I agree that's probably pushing it too close.
I don't agree with the 440W recommendation for a 2X GTX 780. While gaming demands are reasonable, we should also account for stress testing. Titles like AC Unity actually involve such loads, meaning a GTX 780 could be pushed beyond 220W, especially when overclocked.
The base frequency is 863MHz. Anandtech boosted the GTX 780 to 1063Mhz. This represents a 55W rise from the original power draw, which at 80% efficiency adds about 44W. Overall it's around 290W.
I don't agree with the 440W recommendation for a 2X GTX 780. While gaming demands are reasonable, we should also factor in stress testing. Titles like AC Unity actually include such loads, meaning a GTX 780 could be pushed beyond 220W, especially with overclocking. Check my updated comment for more details. My revised estimate for his system is around 730W.
Wait, so now you say you think it's not fine, right after I said I think it's fine?
😛
I gotta quit changing my mind.
My new thing is that we don't know enough about the PSU to be able to determine how it will run or not. As I said, Jonnyguru does not test everything, they don't have the resources some other places do, so we don't know when the protections kick in, or how the voltages are when the PSU is overloaded. If we knew those two things, we could easily figure out if this was sufficient or not.
A bit puzzled about whether everyone is proposing a new unit or just trying this out. I don’t mind if the PSU gives up too much, as long as my other parts stay okay. Also, considering it. The Hdds won’t all run at once since I probably have different raid setups.