[Various] Radeon VII Reviews - Page 85 - Overclock.net - An Overclocking Community

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[Various] Radeon VII Reviews

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post #841 of 894 (permalink) Old 03-07-2019, 05:06 AM
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WannaBe Ocer: Your Radeon VII needs a waterblock, especially since you are already running a custom loop.

The criticism and praises for this card range from the restrained to the extremes.

Having replaced a GTX 1080 water cooled with a Radeon VII in a 2700x rig and also owning a GTX 1080TI water cooled in a 5960x OCd rig, the Rad VII now "feels" like a competitor to the 1080TI. That's not a knock at the GTX 1080, a classy efficient card, but a statement that the Rd VII now has the chops to stand toe to toe with a 1080 TI. To expect it to beat or even come close to a $1200 GTX 2080TI is not in the cards.

The 2080 is a different card based upon a Turing chip. The Rad VII is close enough to it that it's hard to argue one is clearly superior over another.
The 2080 uses less power. The 2080 has ray tracing but most of the reviews indicate , that at present the 2080 isn't the best card for this. The Rad VII has double the memory and it is HBM2, but I haven't seen a test that show this to be an advantage over the 2080 with 8g DDR6.

I suspect the Rad VIIs release was a desire of Dr. SU to have the RTG division release a more powerful high end consumer card to plug the gap from Vega56/64 while the Navi group gets time to polish their chip. In addition it was a neat way to utilize marginal MI50 chips. Finally, "big" Navi" probably won't be released this year. RTG needs a Navi to compete with Nvidia's "Uber" release the GTX1660TI

WannaBeOcer has a right to express an opinion.

At least WannaBeOCer owns a Rd VII.

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Last edited by skline00; 03-07-2019 at 10:26 AM.
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post #842 of 894 (permalink) Old 03-07-2019, 05:45 AM
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Quote: Originally Posted by skline00 View Post
The 2080 uses less power, but not a significant amount less
The 2080 takes 30-40% less power than the VII when both at stock (depends on site, test). That is not insignificant amount considering OC headroom.
Power wise the VII is closer or above the 2080 TI.
TPU measured performance per watt, the 2080 is 40% more efficient in their overall test.

It is significant. Maybe not to you, but it exist.
Of course it can depend on the specific card and its cooler, but needing to dispense more heat in the system affects the whole system, and its OC headroom.

AMD are not power efficient for the last good several generations. We all know that, so there is no need to intentionally mitigate it as irrelevant or that it doesn't exist.


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post #843 of 894 (permalink) Old 03-07-2019, 06:56 AM
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Let's check a 403w 2080ti trio perf/w.................

turing oc headroom is 100mhz if lucky, are you serious?

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post #844 of 894 (permalink) Old 03-07-2019, 10:23 AM
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There is tons of overclocking headroom with Pascal and Turing, if you calculate it the right way. Just ignore the actual boost speeds at stock settings and use the numbers on the box.

My 1080ti overclocked nearly 30% using the box numbers, or 7% if I used the actual boost speeds when stock. That 7% is just slightly less than my RVII's overclock percentage of 8%. Keep in mind that the 1080ti had the benefit of an EK block and a 480mm rad while the RVII is using the factory cooler at ear bleeding volume levels. I would say overclocking headroom is fairly equal between the two on average but it will really come down to the chip on your card and not which card you bought.

Power efficiency is another story, but I will leave that to the people who really care about those things. All that matters to me is not tripping the breaker.

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post #845 of 894 (permalink) Old 03-07-2019, 10:25 AM
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Defoler, I stand corrected about the power draw difference between the GTX 2080 and the Rad VII.

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post #846 of 894 (permalink) Old 03-07-2019, 10:52 AM
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Quote: Originally Posted by ilmazzo View Post
Let's check a 403w 2080ti trio perf/w.................

turing oc headroom is 100mhz if lucky, are you serious?
not disagreeing with power/performance but . . 100mhz of WHAT?

+100 over the 100mhz the AIB OCed the card to?

and then add the 30-60mhz gpu boost 3 gives you?

the reference boost clock for the 2080ti is 1545 (1635 for FE) so you're saying they all just hit 1650?

sorry you just hit a sore spot, so many times helping someone OC their maxwell card and being told +100 in AB; that could mean a clock speed of 1350 to 1550 at a given voltage; the difference between a dog and great card.

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post #847 of 894 (permalink) Old 03-07-2019, 12:51 PM
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He probably means 100mhz over the cards actual stock boost speed and not the irrelevant number listed in the specs.

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post #848 of 894 (permalink) Old 03-07-2019, 02:57 PM
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I wonder how much the HBM2 memory contributes to the TDP of the VII? Is this where most of the additional power draw of the VII over a 2080 comes from?

Wouldn't the HBM2 make high levels of AA practically free for the VII?
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post #849 of 894 (permalink) Old 03-07-2019, 03:07 PM
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Quote: Originally Posted by 8051 View Post
I wonder how much the HBM2 memory contributes to the TDP of the VII? Is this where most of the additional power draw of the VII over a 2080 comes from?

Wouldn't the HBM2 make high levels of AA practically free for the VII?
Using HBM2 lowers power draw. It's why V7s power consumption is within reason.
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post #850 of 894 (permalink) Old 03-07-2019, 03:07 PM
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Quote: Originally Posted by 8051 View Post
I wonder how much the HBM2 memory contributes to the TDP of the VII? Is this where most of the additional power draw of the VII over a 2080 comes from?

Wouldn't the HBM2 make high levels of AA practically free for the VII?



From what I remember HBM2 actually has fairly low power draw (25-30w), while GDDR5x and GDDR6 have pretty high power draw (around 55-60w)
According to Anandtech, the Fury X's HBM memory draw a bit under 15w. HBM2 is more efficient, but has more of it so that 25w estimate people mentioned seems like it would be accurate. They do however say that GDDR5x on a 256-bit bus is estimated around 20w, and GDDR6 is a bit more efficient. So even on a 384 bus I wouldnt think it should reach anything close to 55w. Sounds to me like the memory on R7 and 2080 may be pretty similar power?


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