Vendor Cards: MSI NX7800GTX
by Derek Wilson & Josh Venning on July 24, 2005 10:54 PM EST- Posted in
- GPUs
Heat, Power and Noise
We measured heat, power, and noise the same way that we did with the EVGA e-GeForce 7800 GTX, by looping a Battlefield 2 time demo for about 45 minutes to stress the system.Heat
An interesting thing that we noticed about this card is that it runs a lot cooler than the EVGA. We attained an idle temperature of 40 degrees Celius as opposed to EVGA's 46° C, and when we started running tests, our suspicions were confirmed. Clocked normally, the MSI NX7800 GTX reached a peak temperature of 75° C, and only went up by one degree when we overclocked it. EVGA's temperature was 81° C for both the 475MHz and 450MHz clock speeds, which is a significant difference. This might be the card to go with if you live in an extremely hot area as it seems to handle its heat pretty well. Of course, heat can vary as much as the ability to overclock in every card, so it could simply be a case of the MSI board having a "sweeter" chip.
Power
We measured power at the wall outlet in the different states as described in the last article to get an idea of how much of a power load the card uses.
While the system was idle, we observed that the power load was 147 watts, which is about 6 watts more than the system with the EVGA card. Although the temperature of this card was lower than EVGA's, it is odd that the card seemed to create a larger power draw on the computer. As the graph shows, at 430 MHz, the power load is 271 W, and overclocked to 485MHz, it's 277 W. EVGA's card had only 268 W at 450MHz, and 272 W at 475MHz.
Noise
As with the EVGA card, we didn't notice anything strange about the fan noise. It wasn't especially quiet or loud from a subjective standpoint compared to other 7800 GTX cards. We used the formula mentioned before and reached the end result of 39.2 dB. This is slightly higher than the EVGA card's noise level.For those interested, the formula looks like this (all sound measurements are made at a stationary position one meter from the system):
gpufactor = (10(SPLsys / 20))2 - (10 (SPLamb+cpu / 20))2SPLsys is the measured SPL of the entire system.
SPLamb+gpu = 20 log(sqrt(gpufactor + (10( SPLamb / 20))2))
SPLamb is the SPL of the room with the computer shut down.
SPLamb+ cpu is the measured SPL of the system without the graphics card installed.
Since the heat sinks have been the same so far, it's no surprise that there isn't much difference in noise levels. Likely, there will not be much of a difference between future cards, except if we see things like varying fan speeds or, of course, different styles of heat sinks.
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Fluppeteer - Friday, July 29, 2005 - link
"Advertise" is perhaps a strong word, but the PDF data sheet on the eVGA web sitedoes say that one output is dual link (even though the main specifications say
the maximum digital resolution is 1600x1200, which is nonsense, like all resolution
claims, even for most single link cards).
I couldn't (last I looked) find anything about dual link support on the MSI site.
But then, MSI have in the past ignored that the 6800GTo was dual link, and then
claimed that their (real) 6800GT *was* dual link, and that the SiI transmitters
were unnecessary... (Although I'm still mystified how the PNY AGP 6600GT seems to
have dual dual link support without external transmitters.)
I'm presuming both heads have analogue output, btw (I only ask because the GTo,
for some astonishing reason, only has digital output on its single link head).
Past experience (with the 6800) suggests that the reason none of the manufacturers
mention it is that very few people actually know what dual link DVI *is*. A lot
probably haven't tried it - there being, last I looked, only three monitors which
can use it anyway, two of which are discontinued. nVidia caused a lot of confusion
by claiming support in the chipset and putting an external transmitter on their
reference card, which most manufacturers left off without updating their specs.
Unfortunately, nVidia seem to fob off all their tech support to the manufacturers,
who aren't always qualified to answer questions - I've not found anywhere to send
driver feature requests, for example. Seeing the external transmitter make it to
released boards is a vast relief to me.
Now the Quadro 4500 has been announced, I'm hoping the 512MB boards will appear
(and they might be DDL). Fingers crossed.
DerekWilson - Thursday, July 28, 2005 - link
Yes. Again, the SI TMDS for dual-link is on the pcb. So far there are no 7800 cards that we have seen without dual-link on one port.NVIDIA didn't even make this clear at their initial launch. But it is there. If we see a board without dual-link we'll let you know.
Wulvor - Monday, July 25, 2005 - link
For that extra $4 you are also paying for a longer Warranty. eVGA has a 1+1 warranty, so 1 year warranty out of the box, and another 1 year when you register online at eVGA. MSI on the other hand has a 3 year warranty, and BFG a lifetime warranty.It must be the corporate purchaser in me, $4 is well worth the extra year ( or 2 ), but I guess if you are going to be on the "bleeding" edge, then you are buying a new video card every 6 months anyways, so who cares?
smn198 - Monday, July 25, 2005 - link
A suggestion:Regarding measuring the card's noise output and the way you measured the sound
"We had to do this because we were unable to turn on the graphics card's fan without turning on the system."
Would it be possible to try and measure the voltages going to the fan when the card is idle and under full load? Then supply the fan with these voltages when the system is off using a different power supply such as a battery (which is silent) and a variable resister.
It would also be interesting to see a graph of how the noise increases when going from idle to full load over 10 minutes (or however long it takes to reach the maximum speed) on cards which have . Instead of trying to measure the noise with the system on, again measure the voltage over time and then using your battery, variable resistor and voltage meter recreate the voltages and use this in conjunction with the voltage/time data to produce noise/time data.
Thanks
DerekWilson - Monday, July 25, 2005 - link
We are definitely evaluating different methods for measuring sound. Thanks for the suggestions.Just to be clear, even after hours of looping tests on the 7800 GTX overclocked to 485/625, we never once heard an audible increase in the fan's speed.
This is very much unlike our X850 parts that spin up and down frequenly during any given test.
We have considered attempting to heat the environment to simulate a desert like climate (we've gotten plenty of email from military personel asking about heat tolerance on graphics cards), but it is more difficult than it would seem to heat the enviroment without causing other problems in our lab.
Suggestions are welcome.
Thanks,
Derek Wilson
at80eighty - Tuesday, July 26, 2005 - link
We have considered attempting to heat the environment to simulate a desert like climate [...] but it is more difficult than it would seem to heat the enviroment without causing other problems in our labDerek, If you really wanna simulate desert like heat in the room, may i suggest inviting Monica Belluci to your lab ....should work like a charm :p
reactor - Monday, July 25, 2005 - link
Ive been using MSI cards for a few years now, there fans always seem to run at top speed and ive found they usually run at higher RPM's(Slightly louder) than other manufacturers. I think that explains why the card is cooler while drawing more power, and why you didn't notice a difference in sound as the card was stressed. Im not entirely certain, but thats from my own expenriances with MSI cards.Good article, looking forward to the BFG.
yacoub - Monday, July 25, 2005 - link
"As you can see, The EVGA slightly outperforms the MSI across the board at stock speeds."Either I'm reading it wrong or you mis-wrote that line, since I see the e-VGA normal and OC'd, the NVidia reference, and the MSI OC'd, but no MSI at stock speeds. Thus it's hard to compare th EVGA stock speeds vs the MSI stock speeds when one of them isn't on the charts.
DerekWilson - Monday, July 25, 2005 - link
Check the bold print on the Performance page --MSI stock performance is the same as the NVIDIA reference performance at 430MHz ...
To compare stock numbers compare the green bar to the EVGA @ 450/600
Sorry for the confusion, but we actually tested all the games a second time and came up with the exact same numbers. Rather than add another bar, we thought it'd be easier to just reference the one.
If you guys would rather see multipler bars for equivalent results across the board, we can certainly do that.
Thanks,
Derek Wilson
davecason - Monday, July 25, 2005 - link
Since the MSI card drew a lot more power than expected but remained cooler than the eVGA card, I was thinking that some of the excess may be due to the cooling of the card itself. Maybe the fan on the MSI card works harder than the one on the eVGA card.The people at Anandtech could test the power usage of the stock video-card cooling fans independently to see what their effect is on power load. This may explain the 6 extra watts used by the MSI card. This information might be mildly useful to a person who was already stressing out their power supply with other things (such as several hard drives). Does anyone think that is worth doing?