GTX660Ti Overclocking? Confused.

[Shocky-FM]

Just moved over to a pair of GTX660Ti cards from a GTX580 and don't understand how overclocking works on these cards. I'm using Google but I'm just getting more confused.

Afterburner has power limit? Core clock and Memory +0? why not just list the current GPU and Memory speeds as with previous cards?

Also whats this Boost thing , GPU-Z is showing GPU clock 1020 and Boost 1098? So what it's running at? 1020 or 1098?

 

[Shocky-FM]

I don't get it, GPU-Z reads GPU Clock as 1228.5MHz while playing Crysis.

 

[flinco]

1020 is the base clock. It will automatically overclock itself to the boost clock. The boost clock will always generally be higher than what is stated. So instead of boosting to 1098 it does 1228 instead.

 

[Shocky-FM]

1020 is the base clock. It will automatically overclock itself to the boost clock. The boost clock will always generally be higher than what is stated. So instead of boosting to 1098 it does 1228 instead.

That's pretty cool.

Is it worth overclocking these?, sure I can increase the base clock and Power Limit but I have no idea what the end results going to be while actually in a game.

 

[imginy]

Setting the power limit to max (114) will let the card go a bit faster when it needs to but even when set to 114 it will very rarely ever go over 100% in game.

Turning the core clock up will improve the both the normal clock and the boost clock.

Turning up the memory clock will help a lot on the 660ti.

On my msi at stock volatge I can use these setting for a quite a big improvement in games.

power limit 114
core clock +50
memory +500

If I up the voltage a bit I can use these settings for a bigger improvement.

power limit 114
core clock +100
memory +600

One more thing if it's anything like mine turning up the core clock will have very little affect unless you overclock the memory as well.

 

[Nuclear Fusion]

Memory overclocking tends to have more of an impact than core overclocking with the 660Ti, mainly due to having just as fast a GPU as a 670 (so not really limited in that regard) but with only a 192 bit memory bus (which limits it with high levels of AA or high resolutions) so memory overclocking will give you a good performance increase.

 

[ebilcake]

I will have a play around with the memory overclock tonight, can you disable the boost function and set the core speeds manually or is it just not worth it?

1200+ on the core seems pretty fast enough to me but will that speed be used in every game or just when it feels it needs it? how consistant are the boost clockspeeds?

 

[Rusty0611]

I will have a play around with the memory overclock tonight, can you disable the boost function and set the core speeds manually or is it just not worth it?

1200+ on the core seems pretty fast enough to me but will use that speed in every game or just when it feels it needs it? how consistant are the boost clockspeeds?

No you can't disable it. There's no need to though. It means it's only running full throttle when it's needed.

 

[richy850]

I HAVE MSI 660TI AND AM RUNNING +50 CORE VOLTAGE
+140 CORE CLOCK
+300 MEMORY CLOCK
POWER LIMIT 114

IS THIS OK ?

 

[Shocky-FM]

Memory seems to overclock ok +500 is fine.

However if I edit the power limit and core clock things get unstable quickly, even +50 caused a crash.

I think I prefer manual overclocking to this, boost seems to just do whatever it wants.