jmj95
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I have the EVGA 750 ti Sc 2GB. This model is listed as having a 60watt TDP thus not needing any external power connectors. However It has come to my attention the the max boost overclock of 1415 mhz is not maintained consistently as reported by MSI afterburner. So I used GPU-z to determine why. While running the heaven benchmark GPU-z indicates two Perfcap reasons 1. Pwr: limited by total power limit. and 2. VOp limited by operating voltage. I went to investigate the power limit. I extracted the BIOS of my GPU and viewed the the settings with Kepler bios tweaker 1.27. I saw a Max limit of 38.5 watts. Well below the TDP of 60watts which is well below the 75 watts that can be provided by a PCIE 3.0 x16 slot.  The picture above shows the Max wattage limit of 38.5 volts. in I believe the TDP and PCIe slot tables.  the picture above shows a brief history of the perfcap reasons after running the heaven benchmark for a few minutes. yellow = VOp, Green= Pwr limit Does this mean that I need to Increase the wattage in the power tables and then flash my GPU with the modified Bios? Do I also have to increase the voltage? I only wish to increase it to 45 watts or less. So that I can maintain a max boost overclock in the 1400s MHz range. My temps are no more than 60* C even with a hot room.
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Sajin
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Re: Peformance of 750ti SC being limited by pwr limit, breaking max overclock consistency
2015/08/18 14:28:11
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jmj95
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Re: Peformance of 750ti SC being limited by pwr limit, breaking max overclock consistency
2015/08/18 14:29:33
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Sajin
Yep.
Do you have any experience regarding flashing and modifying bios?
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Sajin
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Re: Peformance of 750ti SC being limited by pwr limit, breaking max overclock consistency
2015/08/18 14:35:16
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jmj95
Sajin
Yep.
Do you have any experience regarding flashing and modifying bios?
Yes.
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jmj95
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Re: Peformance of 750ti SC being limited by pwr limit, breaking max overclock consistency
2015/08/18 14:39:40
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Sajin
jmj95
Sajin
Yep.
Do you have any experience regarding flashing and modifying bios?
Yes.
How would you safely and succesfully flash a 750 ti, after editing the power tables from 38.5 watts to 45 or less watts, in a copy of the very bios it used while using windows 10 pro 64 bit?
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Sajin
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Re: Peformance of 750ti SC being limited by pwr limit, breaking max overclock consistency
2015/08/18 14:56:51
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You'll need to use the latest version of nvflash to save a copy of your vbios then use kepler bios tweaker to edit it, after the editing is done you will need to use nvflash to flash your modded vbios to the card.
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jmj95
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Re: Peformance of 750ti SC being limited by pwr limit, breaking max overclock consistency
2015/08/18 15:05:09
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Sajin
You'll need to use the latest version of nvflash to save a copy of your vbios then use kepler bios tweaker to edit it, after the editing is done you will need to use nvflash to flash your modded vbios to the card.
would modifying the fields i highlighted in the picture from 38.5 watts to 42 watts be safe for my card?
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Sajin
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Re: Peformance of 750ti SC being limited by pwr limit, breaking max overclock consistency
2015/08/18 15:13:32
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Increasing the TDP & PCI-E to 42 will be safe for your card.
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jmj95
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Re: Peformance of 750ti SC being limited by pwr limit, breaking max overclock consistency
2015/08/18 15:16:58
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ok thanks. would this guide regarding the command prompt do fine? www . overclock . net/t/1523391/easy-nvflash-guide-with-pictures-for-gtx-970-980 remove the spaces.
post edited by jmj95 - 2015/08/18 15:19:29
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Sajin
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Re: Peformance of 750ti SC being limited by pwr limit, breaking max overclock consistency
2015/08/18 15:35:21
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HeavyHemi
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Re: Peformance of 750ti SC being limited by pwr limit, breaking max overclock consistency
2015/08/18 16:08:41
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jmj95
Sajin
You'll need to use the latest version of nvflash to save a copy of your vbios then use kepler bios tweaker to edit it, after the editing is done you will need to use nvflash to flash your modded vbios to the card.
would modifying the fields i highlighted in the picture from 38.5 watts to 42 watts be safe for my card?
Safe is relative. There is always some increased risk running past the stock limits. Be aware that if you brick or damage your GPU and you cannot reflash the GPU to a stock BIOS, EVGA may not honor your warranty. Secondarily, as the tables you are asking about modifying are for the PCIe power input, I don't believe adjusting those is going to have any impact on your power draw (as you do not have PCIe power cables) or accomplish what you're intending. The one you don't have highlighted is for the PCIe slot power, which is set to ~70 watts. This is technically a bit over the 66 watt limit of the +12v input as the +3.3v on the PCIe slot is also included as part of the 75 watts (3.3 V × 3 A + 12 V × 5.5 A = ~75 watts) the PCIe slot can provide as per spec.
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jmj95
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Re: Peformance of 750ti SC being limited by pwr limit, breaking max overclock consistency
2015/08/18 16:17:35
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HeavyHemi
jmj95
Sajin
You'll need to use the latest version of nvflash to save a copy of your vbios then use kepler bios tweaker to edit it, after the editing is done you will need to use nvflash to flash your modded vbios to the card.
would modifying the fields i highlighted in the picture from 38.5 watts to 42 watts be safe for my card?
Safe is relative. There is always some increased risk running past the stock limits. Be aware that if you brick or damage your GPU and you cannot reflash the GPU to a stock BIOS, EVGA may not honor your warranty. Secondarily, as the tables you are asking about modifying are for the PCIe power input, I don't believe adjusting those is going to have any impact on your power draw (as you do not have PCIe power cables) or accomplish what you're intending. The one you don't have highlighted is for the PCIe slot power, which is set to ~70 watts. This is technically a bit over the 66 watt limit of the +12v input as the +3.3v on the PCIe slot is also included as part of the 75 watts (3.3 V × 3 A + 12 V × 5.5 A = ~75 watts) the PCIe slot can provide as per spec.
I just changed the higlighted fields from 38.5 watts to 41 watts. I havent noticed any difference in performance with passmark 8.0 and i still get a pwr limit and VOp in the perfcap while running heaven.
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Sajin
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Re: Peformance of 750ti SC being limited by pwr limit, breaking max overclock consistency
2015/08/18 17:03:38
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Try the following... 30000 65500 65500 70000 70000 70000 30000 65500 65500 
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jmj95
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Re: Peformance of 750ti SC being limited by pwr limit, breaking max overclock consistency
2015/08/18 17:17:48
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Sajin
Try the following...
30000
65500
65500
70000
70000
70000
30000
65500
65500
Are you sure that it would be safe?
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jmj95
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Re: Peformance of 750ti SC being limited by pwr limit, breaking max overclock consistency
2015/08/18 17:32:25
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ok I set it to 65 watts and I still get the pwr limit reported by GPU-z. It still does not maintain the max overclock in heaven unity.
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jmj95
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Re: Peformance of 750ti SC being limited by pwr limit, breaking max overclock consistency
2015/08/18 18:52:21
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Ok in Just cause 2 the game is limited by VOp aka limit by operating voltage. Does this mean I should overvolt using afterburner?
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jasonkresge
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Re: Peformance of 750ti SC being limited by pwr limit, breaking max overclock consistency
2015/08/25 13:11:21
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I don't know why it's showing such low wattage as a cap. I've seen reputed benchmarks sites show that card as drawing 58w while running Furmark.
And this is pure ignorance on my part, but I wouldn't initially trust something called KEPLER bios tweeker to adjust the bios on a MAXWELL card without first confirming that it has forward compatibility with the Maxwell v1 platform. Again, this is pure ignorance on my part.
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Sajin
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Re: Peformance of 750ti SC being limited by pwr limit, breaking max overclock consistency
2015/08/25 13:45:45
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Using the kepler bios tweaker to just adjust the power table on a maxwell card is perfectly fine as the power table is properly detected. You could try using the Maxwell II Bios Tweaker v1.36 but I doubt it will make a difference.
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phosgene2
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Re: Peformance of 750ti SC being limited by pwr limit, breaking max overclock consistency
2015/08/28 22:44:16
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this seems like a lot of effort. i have one of these cards that i got about 1 month ago. i spent a little time with the precision x and made a profile with a slight tweak to a 1383 gpu boost clock. it works fine. now granted, i don't really know what i'm doing, but so far i haven't had much success going significantly beyond where i have it set now w/o the card flipping out. i figure there is probably 2 to 3 percent left on the table and to me it isn't worth the effort really.
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