How to find your real GDDR frequency

[Blacky]

A good practice is to first just OC the core, see if it's stable. Then OC the memory and see if it's stable. If it becomes unstable, keep the memory OC and downclock the core to see what happens.

Getting a stable OC requires some time and patience.

[aduy]

anyone know what the chips on the 485m are rated for?

[Blacky]

As far as I know, they are the same as for the 470M and the 460M.

[aduy]

ok, so just a theoretical question, if one were to solder on faster memory, would that even work?

[Blacky]

ok, so just a theoretical question, if one were to solder on faster memory, would that even work?

Theoretically.... yes...

[darxide_sorcerer]

A good practice is to first just OC the core, see if it's stable. Then OC the memory and see if it's stable. If it becomes unstable, keep the memory OC and downclock the core to see what happens.

Getting a stable OC requires some time and patience.

oh, the OC is very stable, from playing games to watching videos to editing photos. it's only Battlefield 3 that crashes from time to time (and there are many reports of the same happening to other people with different GPUs and with or without overclocks). my guess is that it's a combination of the drivers + Battlefield 3's buggy code, and here is my reason. i once updated my drivers from the ones i'm currently using (Catalyst 11.6) to a newer version provided by SONY (mix of Catalyst 11.6 and Catalyst 11.8), and BF3 kept crashing over and over and over, every five minutes. i reverted back to the older ones, and the stability returned.

i also have to mention that the GPU temperatures is always below 86C when playing BF3, and that is the highest it's ever getting. of course, there is no VRAM temperature sensor in my laptop, but my notebook cooler is blowing cool air directly to the memory chips through the air-intake grills at the bottom of the laptop.

so, my question: considering that the memory chip is designed to run at 933MHz and that its default clock is 800MHz in this laptop, is there a danger in running the chips at a higher clock than 933MHz?

PS: i lowered the memory OC from 945MHz to 933MHz and increased the core from 725MHz to 745MHz on 904mV core voltage (so my new OC values are 745MHz core/933MHz memory/904mV voltage; i.e., ~ 54% increase in core frequency, ~17% increase in memory frequency, ~0.4% increase in core voltage over the default values). playing BF3 for about two hours was rock solid.

[Blacky]

I can't say for each memory what will happen if you go above manufacturer specified clocks. But I can assure you that as long as you keep within the manufacturer's specified clocks, your OC should be stable.

[moral hazard]

ATI 3870 (alienware? MXM 2.1) = 11 = 900Mhz.
H5RS5223CFR-11c

ATI Asus 4870 (MXM 2.1) = N0 = 1Ghz
H5RS5223CFR-N0C

[moral hazard]

4870m MXM Type III Alienware 11 900 Mhz Qimonda.

[Meaker]

ok, so just a theoretical question, if one were to solder on faster memory, would that even work?

Usually on nvidia cards it is the memory controller/PCB holding the speeds back rather than the memory chips.