Cheers for the info Dookey and Groovriding, has saved me a lot of mucking about.. :thumbsup:
My theory is your RAM was error correcting at 1740 causing your lower scores.
There are memory "holes" and error correction that kick in as you go up. At 7.4GHz I'd guess error correction as above. This is the only article I know of that touches on memory overclocking (drops as you go up) but didn't hit error correction iirc.
http://www.thetechbuyersguru.com/VRAMocing.php
Discovered the same thing benching Heaven and Valley 1300/1740 @1.3v produced significantly lower scores than 1240/1700 @1.24v. My guess was VRMs overheating and throttling down.. if anyone has a better theory please share.
New Bios. #YOLO. If you aren't using an unlocked engineering bios with a high watt limit, then Nvidia's GPU Boost technology is making your card throttle. There is circuitry separate from the VRM area that is monitoring the amount of power flowing through the VRMs. That circuitry in combination with the bios causes throttling. Circumventing that circuitry's protection mechanisms are one goal of these custom bioses. When the ability to adjust memory voltage gets here, your 6800-8000mhz mem clocks will throw up big numbers as you rise from 6000mhz to 8000+mhz without error correction lowering scores because more volts will keep memory steady with error rates low... That's the memory side of things. The higher power limit bios affects memory now, and will later.
The GPU is pulling 3/4ths of the total TDP, the other quarter coming from the memory. On the Kepler cards, Nvidia introduced a new daughter-board PCB that constantly monitors power, current & temp. The bioses that keep Nvidia GPU Boost enabled will keep power consumption under that power limit under all circumstances as a top priority. That means your gpu core clock will throttle down, both your core & mem voltages and timings will decrease, your memory will have a higher rate of error correction as a result and all your benchmark scores will decrease. You absolutely must have an unlocked high powered engineering bios with a disabled boost & LLC if you want to keep a high clock that doesn't crash, doesn't throttle, and doesn't produce lower benchmark scores. When clocking your core, core voltage dictates about 80-90% of what the resulting current and temperature will be, while the clockspeed in mhz represents the remaining 10-20%. An increase in voltage is 5x to 6x more likely to increase power and temperature than what increasing the clockspeed does. However, voltage does nothing for your benchmark scores, only the clockspeed. That add-on PCB with dedicated hardware & locked bios is monitoring your amperage & throttling the card in every way possible to keep the wattage under the factory default Power Target. Afterburner may not display core clocks throttling down even though they are. Memory speed could falsely report a consistent readout while memory voltage is reduced to retain overall current draw, increasing errors, and lowering scores.
If you saw the discrepancy in those scores and are already using Skynet's latest 440 Watt Titan bios, then please post a graph of Afterburner (while bench is run) showing all your stats for temp/voltage/speed/fan/clock/mem/core/etc and we can troubleshoot it further. If you do not yet have this high power unlocked bios, throttling to preserve PT may be a reason why you see low scores going 1.24v -> 1.3v, even despite higher frequency.
Classifieds are awesome. Just look at Grooveriding's here in this thread he has two that go over 1.4g @ less than 1.35v. Previous page I linked to a thread at techinferno for the 572 watt classified 780 bios where a guy is running at 1700mhz core! For any super high OCing you want cold air or water, and an unlocked bios. The colder things are & lower the temperatures, the higher and more stable the overclocks become.
1240 core you got on your 780 is probably around the average max that a Titan does on air. The Titans near 1.4ghz are on full cover waterblocks with high power targets, unlocked bioses, low temperatures. Try skynets unlocked 780 440w bios, I'd say with that you could probably go from 1241 -> 1350ish for a bench run.
Usually they have around 40C core temp & 80C near the VRM areas. That cool GPU allows it to clock higher. And the active waterblock cooling over the VRMs keeps power steadier & safer & cooler. For anyone fearful of frying a VRM, most of those guys on HWbot when their VRM popped they only have Ram sinks & Hi flow deltas blowing on the them while their tek9s are only on the cores. A full cover waterblock is going to keep temps much lower than a ram sink and fan.
vrms arent gonna pop on your classified. u can push that card through the roof.
probably check the 780 club thread to see how far people are pushing the 780 ref cards.
How fast is a 1.4ghz Titan? Double the speed of a stock GTX770 / HD7970 GE
I am looking at getting either a gtx 780 or a titan for gaming and need help building the pc. I need to play games in 1080p at 60 fps, my internet connection is 100 mbps. I am looking to spend 2-3k on the build but need a builder any suggestions guys?
Tried the other BIOS. No love My core is just limited to 1241.
The BIOS in the Classified thread is specific to the Classified.
I don't think you need a post count, just to be a registered member, to download.
Thanks for the quick answer. The vbios im looking at is the 1.4v Titan/780 in the OP of this thread...I don't see Classified mentioned anywhere. Also, I still get an error when trying to download the file, even being registered. I checked out the thread you mentioned, but i couldn't find a vbios for increasing the power TDP past 115% (330w) The only other one is the 440w but I think that automatically forces it to 440w