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Overclocking on 790GX takes a slightly different form that it did on any previous AMD-based chipset as a direct result of the Advanced Clock Calibration feature introduced with the SB750 southbridge. Rather than simply tweaking and tuning multipliers, interconnect speeds, voltages, and timings, there’s one step interjected between running at stock speeds and picking an overclocking target.
Mainly, that step involves enabling ACC, either through a motherboard BIOS or using the OverDrive utility, and choosing a “value” corresponding to ACC. The value in question ranges from -12% to +12% and starts at zero. What exactly does it represent? Good question — AMD is staying deliberately quiet on the exact definition. However, all indications point to the loosening and tightening of tolerances. With a Phenom X4 9950 or 9850, AMD recommends opening ACC up to +2% or so. A slower chip, like an older 9600, might be able to withstand +4% or +6%. You get the idea.
AMD says that ACC will help improve the overclocking headroom of any Phenom chip, though it recommends Black Edition CPUs most highly. Perhaps that’s because it can be so challenging to get stable overclocks out of the HT reference clock alone.
With ACC turned on and set to the “margin” of your choosing, it’s business as usual. Drop down into OverDrive and start tweaking the settings you’d normally use to tune your processor. It’s a good idea to start with a good reference point if you’re really interested in the effects of ACC. We went with a Phenom X4 9850 that, prior to ACC and installed in a Gigabyte MA790FX-DQ6, wouldn’t break past 2.8 GHz using stock cooling and voltages as high as 1.35V.
Skepticism was swept aside when, on the Gigabyte MA790GP-DS4H and using a 1.35V setting, we were able to hit 3.28 GHz with a 205 MHz HT ref. clock. AMD claims ACC will buy most processors between 100 and 400 MHz on top of what they could do sans ACC. Our 430 MHz (beyond 2.8 GHz) overclock falls right in line with those results. After taking a lot of heat for less than stellar scalability, 700+ MHz tweaks should earn AMD’s Black Edition CPUs quite a bit more respect in the overclocking community — so long as ACC doesn’t turn out to make an impact on stability over the long term.
We tried playing with different ACC values (4% and 6%), but didn’t notice any appreciable improvement in headroom. Although we were able to operate well into the 3.3 GHz range, the system didn’t take long to crash once a load was applied to it. With a larger cooler and a bit more juice, 3.4 GHz would have likely been achievable.
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Great review, and it's good to see that AMD is at last able to target more enthusiast markets competitively.
Great review, and it's good to see that AMD is at last able to target more enthusiast markets competitively.
Thanks for the feedback Kit.
^^^iseriously thought that was sarcasm, until i saw the authors name
So... why does a page 15 and 16 of this article exist if there is no page 15 or 16 to the article?
Take a closer look. What happened?
PCMark seems Intel biased, please read this:
http://arstechnica.com/reviews/har [...] view.ars/6
Please change this benchmark suite or check if PcMark Vantage is unbiased.
So... why does a page 15 and 16 of this article exist if there is no page 15 or 16 to the article?Take a closer look. What happened?
That was strange. Should be fixed now.
PCMark seems Intel biased, please read this:http://arstechnica.com/reviews/har [...] view.ars/6Please change this benchmark suite or check if PcMark Vantage is unbiased.
Fortunately, with no Intel platforms tested, this should be a non-issue for the current situation ;-) In the future, you'll be seeing SYSmark, though.
Seems past page 8 or something the links are corrupt.. can't fully read this article and getting error 404 - page not found.
.. and now the article seems to be removed even from the main page!?!?!
.. and now the article seems to be removed even from the main page!?!?!
Alright, mystery solved. It's back up, sans the blank page. Thanks for pointing that out lacrits!
Hi, i wanted to ask something aout the article.
why you use 3470 and 8500 for the tests?
hybrid crossfire and nvidia boost don't work with faster cards?
is the performance gain not big with 3870 or 9600gt?
thanks
Hybrid CrossFireX uses alternate frame rendering, as does GeForce Boost, I believe. As a result, both technologies are best complemented by discrete boards evenly matched to the integrated core. In the case of the GeForce 8300, that'd be an 8500 GT. For the 790GX, AMD recommends the 3470. To spend any more money on discrete graphics for either platform would be a waste of money even if you could use faster cards.
thanks for responding so fast.
so what if i use a 3650 with this board? or why will i buy a quad core and dont spend some more for a 3850?
Unfortunately, performance won't scale with the 3650. With that said, you'll still see reasonable gaming performance in Hybrid CrossFireX. The beauty of this board is that you CAN drop in a 3850, 3870, 4850, etc. and then add a second one later for CrossFireX.
as cool as new main board features are , I think eventually consumer graphics wil move to a poitn where seperate card buses jsut dont cut it, I see a future where a main board has 2 sockets on board one for teh CPU and one for the GPU , at that time i also expect that the main board with have two sets of ram slots as well one set of slots for system ram and one set of slots for video ram. think of teh possiblities such a future could have , instead of replacing an entire component card , you just drop in a new gpu and or add more video ram much as you would upgrade the cpu/system ram. of course in this furture FSB speeds would ahve to reach ridculous proportions , i think this is the only reason that this kind of video ard setup hasnt already happened
Unfortunately, performance won't scale with the 3650. With that said, you'll still see reasonable gaming performance in Hybrid CrossFireX. The beauty of this board is that you CAN drop in a 3850, 3870, 4850, etc. and then add a second one later for CrossFireX.
Nice Review, However I would like to see how well SLI scales on this board using a 4850 and 4870 vs another AMD Board with full Duel 16x PCIE 2.0 Slots.
I've seen some other reviews where Dual 8x PCIE 2.0 Slots start having scaling issues on the 4850 at are not seen on the 3800 Series.
Thank you for this excellent article.
Does the 128mb side-port limit the on board video to that amount of memory? Does this affect Vista Areo?
Good article. Phenom can finally OC. I wounder if the mobo makers are going to make them with higher quality voltage regulators so it can support the 9850BE and higher across the selection.
good review,
i have a question why do you recommend ddr1066 over 800? i thought there wasn't a huge difference.
also im a bit confused about this 16x, vs. 8x 8x...
if i use a single card (for now) which motherboard (790g, 790gx) will produce more graphixs capabilities?
It would have been interesting to see a comparison between the GMA X4500 and the 790GX.
http://www.hkepc.com/?id=1510&page=5&fs=idn#view
The GMA X4500 seems to be much faster than the GMA X3500 and within 10-30% of the 780G in actual games. I guess the 790GX was a timely addition and with it being 20% faster than the 780G, that should open up the lead over the GMA X4500 to 30-50%.