Pwr = Card is running at max clock speeds but does not require full voltages.ĮDIT: I have just finished a 3 hour gaming session in Far Cry 3 without a single issue Vop + VMax = graphics card has reached maximum voltage permitted through drivers (1.2v) though may not have reached maximum clock speeds. It is normal for GPU-Z to display something here, as the card is either under utilised (util) or at maximum performance. Both would turn on at the same time from the signal cables but would double the available power.īasically any reason given is the reason the card has reached peak performance, not necessarily a fault. Link two DA-2 together? - Cut and link the 2 sets of signal cables together but run one DA-2 to the PE4C to provide power to the board and PCI slot, then convert the other DA-2 to a PCI power plug to power the card directly. Standard ATX power supply - and live with the fan noise, mess and size.Ī big-ass capacitor - This would smooth out the voltage and current peaks and drops during unexpected power loads. I would assume it disables boost but I've done that manually with the underclock. There is another option labelled "prefer consistent performance" but I cannot find out exactly what it does or how it differs from Max performance. The default is set to "adaptive" which specifically fluctuates the power to reduce overall power consumption but with unknown effects on peak draw. This locks the card at 1177mhz clock speed and prevents sudden fluctuations in power requirements. The card still boosts to 94% peak, even when limited to 80%.ĭriver Tweaks - In NVIDIA control panel i have changed the power management mode to "prefer maximum performance". This is to prevent the card from exceeding the 145 watt TDP. I have adjusted the "power" slider in MSi Afterburner to 80%. Power throttling - When set to 100% the card boosted to 110%. Underclocking - I have dropped my core clock speeds down by 100mhz, bringing the core clock down to the same as the NVIDIA reference cards (1177mhz). I have had some success here and have not had a bluescreen with these settings yet. This is significantly more than the DA-2 can provide. the DA-2 has been shown to operate closer to 11.7v than 12, and with the GTX 970 peaking over 13v and spending much of its time over 12.5v.Īlthough the GTX 970 is not shown, the GTX 980 shows amperage spikes over 20A and up to 24A at times. The toms hardware article clearly shows that at times the card requires more than 12 volts. In summary NVIDIA lied about the power consumption and although it's average power consumption is lower than similar performing cards it peak and requirements under gaming load are just as high or higher, at times peaking up to 300 watt and consistently sitting around 250 watt under full load.Īfter reading this I am surprised I can run this thing at all from the Dell DA-2 220 watt power supply! There are 3 pages of power consumption results and it is well worth a read through all three as it is very interesting. Midway through writing this post I found this review detailing the exact power requirements of the GTX 970 and 980 cards:Ī New Power Consumption Test Setup - Nvidia GeForce GTX 970 And 980 Review: Maximum Maxwell This gives us a peak power consumption of 165 watt, exactly what the DA-2 can provide efficiency. Now GPU-Z reports the power consumption boosts to 110% of TDP when required. Zotac do not state what their cards max TDP is, but we shall assume it is slightly more due to the slight overclock and dual fan cooling, lets say 150 watt. The GTX 970 reference card is rated at 145 watt TDP. This gives us a power of 165 - 176 watts available. Lets assume the DA-2 has 75%-80% full load efficiency (which seems to be reported by some picoPC forums). I have been experimenting with MSi Afterburner to adjust power requirements and I believe we are simply running out of power from the 220 watt Dell DA-2. I have done some more testing and although not yet conclusive I am seeing a pattern.
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