AMD Kaveri Refresh A10-7870K Apu arrives. - Overclock.net - An Overclocking Community

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AMD Kaveri Refresh A10-7870K Apu arrives.

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post #1 of 537 (permalink) Old 05-14-2015, 01:54 PM - Thread Starter
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So this A10-7870K AMD Apu arrived today supplied from CclOnline for £94.68 ex VAT which converts today to $149.20.

As can be seen, the base/boost speeds are 3.9GHz/4.1GHz but there is no GPU info on the packaging. The only relevant info given is collected into this montage.

So here is AMD's new flagship Apu, the A10-7870K:

At least, AMD have finally supplied a half-way decent heatsink with this APU, but it still comes with the old 70x12mm PWM fan. To save rejigging all the back plates etc. I decided to use my existing setup for the time being, which is a Scythe Mugen 4 with a 120x38mm 3500rpm NMB-Mat push fan.

After installation the Apu posted on the Asus A88X-Pro without any trouble with the usual [F1] prompt to enter the Uefi Bios in default state. The A10-7870K is recognized by the latest BIOS v.1902, but I was surprised by the high CPU voltage of 1.487V as the default setting, which makes me think that Bios 1902 is not completely set up for the A10-7870K.

There were no problems booting into W8.1 and AI Suite 3 agreed with the Voltage/Temperature readings of Uefi Bios. When I attempted the auto overclock I was offered a 4.2GHz OC, slightly in advance of the 4.1GHz OC initially offered last year for the A10-7850K.

With all this preamble out of the the way I set off to see if I could finally get back into the 5GHz Club, so I re-entered the BIOS, set AI Tweaker/Tuner and /CPU Voltage to Manual and disabled Power Now, CPB Mode, C6 Mode and APM Mode in Advanced/CPU Configurations, rebooted into W8.1 and entered the TPU settiing screen in AI Suite 3.

First of all, the 7870K runs happily off lower voltages than the default 1.487V for 3.9GHz and I was able to run 3.9GHz from below 1.2V. I tested 4.0GHz and 4.1GHz at 1.2V without problems, but crashed at 4.2GHz, which required 1.3V to run. I didn't try any intermediate voltages so this is only a rough dividing line.

Rather than sticking with multiples of 100, which CPUZ always used to reduce by a few hertz, just to make you miss a GHz target, I planned my 4.5GHz-4.9Ghz series using clearance multiples (43x105=4515, 44x105=4620, 44x107=4708, 45x107=4815, 45x109=4905). The first three worked fine: 4.515GHz=1.43125V, 4.620GHz=1.45V and 4.708GHz=1.475V; but 4.815GHz crashed with voltage raised to 1.5375V, even with the LLC settings set to extreme, so my 'Hello Boys, I'm Back' poster will have to stay unposted and I will have to leave off testing this chip any further until Asus update the BIOS and/or someone lets us know what the upper limit for CPU voltage is.

Anyway, here's a 4.7GHz CPUZ validation to show for the arrival of the A10-7870K AMD Apu (see that 33 KHz they stole off me!).

http://valid.canardpc.com/qw54as

______________
After 4 weeks since I started the thread I've put together this index of the more informative posts for people trying to get an early glimpse of the A10-7870K.

The Stilt has given the industry's view of the 'Godavari' Apus in an important set of posts:
Post 63: On overclocking with Godavari Apus
Post 72: On Load Line settings
Post 82: 3GHz throttling on the 7870K - definitive answer
Post 98: Dual graphics benches

Two subjects have dominated recent posts:
Post 117 onwards: Issue of different motherboard VRMs leading to skewed review results
Post 125 onwards: Drmrlord and SpeedyVT About HSA and OpenCL

As someone with an early A10-7870K I have also contributed some results:
Post 41: AmdMsrTweaker screenshots giving default P-State readings of 4 flagship Apus(A10-5800K/6800K/7850K/7870K)
Post 45: Voltage tables for 4 flagship Apus giving lowest voltages needed to run P95 at a range of frequencies.
Post 85: Benches in 3DMark, PCmark7, Cinebench and Luxmark v2.0 at 3900MHz and a 4600MHz gaming overclock with a guide on how to set it.
Post 150: Dual graphics test to show an R9-270X and the A10-7870K iGPU working together in OpenCL.
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post #2 of 537 (permalink) Old 05-14-2015, 02:26 PM
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that is cool, how's the benchmark on compute ?
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post #3 of 537 (permalink) Old 05-14-2015, 02:57 PM - Thread Starter
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I'm not sure about this very high default CPU voltage, so I don't think I should do any stress testing until either I get a BIOS that has been specifically updated for the A10-7870K or someone like The Stilt comes online and tells us about what the maximum voltage should be, bearing in mind how low the maximum CPU voltage for the A10-7850K is.
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post #4 of 537 (permalink) Old 05-14-2015, 03:39 PM
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Quote:
Originally Posted by Himo5 View Post

I'm not sure about this very high default CPU voltage, so I don't think I should do any stress testing until either I get a BIOS that has been specifically updated for the A10-7870K or someone like The Stilt comes online and tells us about what the maximum voltage should be, bearing in mind how low the maximum CPU voltage for the A10-7850K is.
I'm pretty sure there are daily driver 7850ks that people have at 1.58vcore as long as its cooled properly. If your nervous about it then contact amd about maximum voltage but this being just a refresh I would say abide by the original kaveri voltages and you should be just fine, like always if within the thermal margins. Also thanks for posting thumb.gif and try a few benches out at 4.5 with less vcore then the stock if you really are concerned and see how it scores.
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post #5 of 537 (permalink) Old 05-14-2015, 04:02 PM
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1.49v is breakdown voltage for the original run of chips. If they have gotten leakage lower somehow on 28nm planar then you might be able to get away with more. The implications of running at or above breakdown voltage are largely unknown, but you may be shortening the usable life of the chip to 1-3 years, maybe not. As always, your mileage may vary.

That being said, 4.7 ghz is sawheeeet. Here's what you do:

Delid that thing (leave the remaining epoxy on the PCB, but scrape it off the IHS)
lap the IHS once you have it off
Reseat the IHS with CLU on the die
use CLU between the IHS and HSF
Get a better HSF or switch to a good AiO or custom water

I picked up 200 mhz delidding/lapping without switching anything else on a 7700k. I think you can hit 4.9 or higher with that chip!

Also, you got it for a stupid-low price! That is a great buy.

edit: SHopBLT has them on pre-order for $154:

http://www.shopblt.com/item/amd-a10-7870k-black-edition-tray/amd_ad787kxdi44jc.html

Not sure of their rep but that's the best I could find state-side.

Watch this space for future . . . uh . . . stuff! Yeah. That.
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post #6 of 537 (permalink) Old 05-14-2015, 04:06 PM
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The maximum voltage is the same as for Kaveri.

I just wonder who slipped these out biggrin.gif
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post #7 of 537 (permalink) Old 05-14-2015, 04:18 PM - Thread Starter
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Originally Posted by The Stilt View Post

The maximum voltage is the same as for Kaveri.

I just wonder who slipped these out biggrin.gif

I seem to remember you recently citing a maximum voltage for the A10-7850K that was less than the 1.487V default for this A10-7870K - I've just been trying to find your post. Maybe the BIOS is setting the default voltage wrong?
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post #8 of 537 (permalink) Old 05-14-2015, 04:26 PM
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PM sent.
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post #9 of 537 (permalink) Old 05-14-2015, 06:02 PM
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Congrats on nabbing an early chip, and nice work on the initial overclocking potential! That said, can you confirm that AMD solved the throttling under load to 3 GHz bug that plagued Kaveri?

Does FOLDING make you feel MAGICAL? Of COURSE it does!

"It may not seem logical, but trust me. I know where I'm going. And it's far."


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post #10 of 537 (permalink) Old 05-15-2015, 01:20 AM
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Oh yeah . . it would be interesting to know if these refresh chips still throttle to p5 state under iGPU load.

Watch this space for future . . . uh . . . stuff! Yeah. That.
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