I see a few varieties of GTX 750. Some don't have additional 6 pin power socket. The Ti and FTW cards usually have this 6 pin power socket, meaning that they need more power then pci-e slot can provide.

However, the Ti and FTW are also clocked higher... So they need the extra power because they run at higher speeds.

If I buy a Ti/FTW version of GTX 750 and then downclock it to the regular 750 speeds, will I still need to provide additional power to the card via 6 pin socket?

---

If the card you get has the additional power connector then use it as it's very likely that some (if not most) of the power circuits have been diverted from the PCI-e interface to the additional power socket.

If you don't want to use an additional power connector then get a model that doesn't have it. ;-)

Cheers.

I have seen 750 Ti cards at stock speed that have a PCIe power connect and OC'd versions that don't. The 750 is 55w at stock speed and the TI is 60w at stock speeds. So either should be fine with no additional power.
I imagine the cards that provide a PCIe connector are to allow more headroom for overclocking purposes.

---

SETI@home classic workunits: 93,865 CPU time: 863,447 hours
Join the [url=http://tinyurl.com/8y46zvu]BP6/VP6 User Group[

I have seen 750 Ti cards at stock speed that have a PCIe power connect and OC'd versions that don't. The 750 is 55w at stock speed and the TI is 60w at stock speeds. So either should be fine with no additional power.
I imagine the cards that provide a PCIe connector are to allow more headroom for overclocking purposes.

The cards that I have say that the extra power is for the two-fan ACX cooler. I guess they feel that OC models are "too close" to the slot-limit. You can get the same clocks on a different card with no 6-pin connection, but one fan.

I did a little bit more reading on the one I am looking at.

It says that the card needs additional 25 Watt and it gets it from psu via 6 pin connector. Here is info from the ad:
"+25 Watts via a 6-pin Power Input The bonus 6-pin power input connector provides an additional 25 watts, giving you an increase in power of 35%! This increase in power gives the card significantly improved overclocking headroom, on average around 80MHz above the maximum clock of the standard card. "

This tells me that most of the power still comes from pci-e slot, so the circuitry has not been diverted. The card itself is already overclocked to 1229 MHz. The stock speed of normal GTX 750 is 1020 MHz.

I don't think I will buy one this time. Overall things do look promising, I think if I buy factory overclocked card and downclock it, I think I should be ok without external power. I will find out in a month or two when I finally buy one.

---

I have seen 750 Ti cards at stock speed that have a PCIe power connect and OC'd versions that don't. The 750 is 55w at stock speed and the TI is 60w at stock speeds. So either should be fine with no additional power.
I imagine the cards that provide a PCIe connector are to allow more headroom for overclocking purposes.

The cards that I have say that the extra power is for the two-fan ACX cooler. I guess they feel that OC models are "too close" to the slot-limit. You can get the same clocks on a different card with no 6-pin connection, but one fan.

Yes, the one I am looking at has ACX cooler with two fans.

---

given all the choices I like the 750 Ti with the stock clock and single fan, part number 02G-P4-3751-KR. the choice is between two fans with the extra power connector or one fan and no power connector, and i vote for the latter.

I just installed a used EVGA 750Ti last Thursday, 02G-P4-3753-KR, that I snagged on eBay for $100 (delivered). It's a single-fan model without an extra connector. It replaced a GT 640 in my xw9400. Theoretically, a non-OC 750Ti should have been using about 5w less power than the GT 640. However, I found that this one was actually drawing a minimum of 4w more, perhaps because it's factory overclocked to 1176 Mhz. It only gets to about 62C with the fan running in default mode. (It actually resides outside the case on a riser cable, since both primary x16 slots inside the case are currently occupied by GTX 660s.)

As far as I can tell, these two are exactly the same with one having the ACX cooler, one without.

BUT, and this may be important, mine from BB with the ACX Cooler are "boosting" much higher than 1255. I just checked, one is at 1320 without my changing anything.


Part Number: 02G-P4-3759-KB

Part Number: 02G-P4-3759-KB
Core Clock Speed: 1176 MHz
Boost Clock Speed: 1255 MHz
Memory Clock Speed: 5400 MHz Effective
Memory Bandwidth: 86.4 GB/sec
Bus: PCI-E 3.0
one 6-pin PCI Express power connector





Part Number: 02G-P4-3753-KR
1176MHz Base Clock
1255MHz Boost Clock
2048MB GDDR5 Memory
5400MHz Memory Clock
86.4GB/s Memory Bandwidth
Total Power Draw : 60 Watts

Part Number: 02G-P4-3753-KR
1176MHz Base Clock
1255MHz Boost Clock
2048MB GDDR5 Memory
5400MHz Memory Clock
86.4GB/s Memory Bandwidth
Total Power Draw : 60 Watts

Yeah, that's the one I'm running. I just checked GPU-Z and the sensor reading it's currently giving for the Core Clock is 1320.2MHz. Don't know what that really means. It's also showing it only running at about 75-80% of TDP at 1.1680V. I haven't tweaked anything, just installed it and let it run!

That 60w power draw estimate is what I expected, versus the GT 640's rating of 65w. So, since my power consumption actually went up 4w (minimum), perhaps the GT 640 was drawing considerably less than the TDP.