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Friday, 04 March 2011 14:16

Sapphire HD 6850 Toxic reviewed - 9. Overclocking; Noise; Temperature;

Written by Sanjin Rados
6850-toxic-thumb

Review: The HD 6850 with two power connectors

 

Sapphire HD 6850 Toxic come factory overclocked; the GPU runs at 820MHz and the memory at 1100MHz (4400MHz effectively).

toxic_6850_trix

Compared to the reference Sapphire HD 6850, which we tested recently, here, Toxic’s voltage is slightly higher. You can see the results we got in Saphire TriXXX below.

sapphire_hd_6850_toxic_trixxx
Sapphire HD 6850 Toxic

sapphire_hd_6850_trixxx
Slika: Sapphire HD 6850

You can see that Toxic’s idle temperatures are lower, which is expected as it has larger cooling. With these things it’s certain – size matters

.

sapphire-6850-and-6850-toxic

Sapphire HD 6850 Toxic uses HD 6870’s PCB, which is longer than that of standard HD 6850 cards. HD 6850 Toxic requires two 6-pin power connectors, in case the card’s overclock requires more juice.

sapphire-6850-and-6850-toxic-power-conector

Intensive operation resulted in HD 6850 Toxic temperatures going up to 77°C. We were happy with the noise levels on the card. Same can be said about reference Sapphire HD 6850, but its lower clocks, lower voltages and specially designed cooling result in significantly lower temperatures than those we measured on the Toxic.

sapphire_hd_6850_toxic_gpuz_temp_load
Sapphire HD 6850 Toxic

sapphire_hd_6850_gpuz_temp_load
Sapphire HD 6850

Sapphire TriXXX allowed us to push the GPU voltage to 1281mV, which helped in pushing the GPU all the way up to 952MHz. This is the maximum we achieved with fan at AUTO settings, where the fan still was not loud.

sapphire_hd_6850_toxic_trixx_oc_auto_fan
Sapphire HD 6850 Toxic OC with auto fan

If you want to squeeze out the last drop of performance from HD 6850 Toxic, you’ll have to increase the fan RPM as well as GPU voltages. Note that overclocking results may vary from card to card.

Sapphire_hd_6850_trixx_oc_manual_fan
Sapphire HD 6850 Toxic OC with manual fan

It looks like we didn’t strike lucky and get a super-overclocker as our test HD 6850 Toxic didn’t like going beyond 987MHz. We had to increase fan RPM to achieve 987MHz, but the fan was already too loud for us to enjoy our overclock.

toxic_oc_avp

Power Consumption

Sapphire's HD 6850 consumes around 15W when idle, which is comparable with the green camp’s GTX 460. During operation, HD 6850's maximum consumption was about 25W less than on the GTX 460 1GB. Sapphire HD 6850 Toxic’s idle consumption is comparable to the rest of the HD 6850 pack, but note that higher clocks mean about 20W higher consumption. Additional overclock to 987MHz increased consumption by about 60W.

 

(Page 9 of 10)
Last modified on Friday, 04 March 2011 21:47
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