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AMD Kaveri A10-7850K Overclock Guide - Page 117

post #1161 of 1334

The main reason for raising BClk on APUs is to overclock memory when the highest available divider is 2400MHz.

 

Raising BClk (100-111MHz) on that divider gives in succession, 2400/ 2424/ 2448/ 2472/ 2496/ 2520/ 2544/ 2568/ 2592/ 2616/ 2640/ 2664MHz. On a good motherboard with some nicely binned RAM 2616MHz is certainly possible in most circumstances and there is a chance of getting some results at 2640MHz.

 

Why would this be so interesting? Because APU performance gets a higher lift from rasing RAM speed than any other overclock, as the following table (albeit for the A10-7870K) shows.

post #1162 of 1334
Guys, i tried again some settings. Just to try my luck...

But i have a question. When i raised the NB voltage to 1.300v i notice a noise from microphone (using OBS). This is because my northbridge is too overvolted or maybe the cause is my PSU who don't "serve" good quality energy? When i saw this, i returned to stock immediately ...
Edited by Katsutoshi - 10/7/15 at 8:07am
post #1163 of 1334
Quote:
Originally Posted by Himo5 View Post

The main reason for raising BClk on APUs is to overclock memory when the highest available divider is 2400MHz.

Raising BClk (100-111MHz) on that divider gives in succession, 2400/ 2424/ 2448/ 2472/ 2496/ 2520/ 2544/ 2568/ 2592/ 2616/ 2640/ 2664MHz. On a good motherboard with some nicely binned RAM 2616MHz is certainly possible in most circumstances and there is a chance of getting some results at 2640MHz.

Why would this be so interesting? Because APU performance gets a higher lift from rasing RAM speed than any other overclock, as the following table (albeit for the A10-7870K) shows.


That's an interesting chart Himo5, but with that divider, how much Vdimm would be needed to maintain something like say 2496 or thereabouts? can these types of systems handle more than 1.65? and what about the latencies? Looks like we will have to use CL 13, 14, or even 15? seriously into DDR4 territory...

Come on AMD, get your desktop DDR4 systems up, running and for sale!! biggrin.gif
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post #1164 of 1334
One question: how does the performance of a A10 7850 compare to a FX8350@ 4.8GHz and HD7870 GHz edition vid card? I was looking at going to an ASUS Crossblade Ranger and the 7850 Kaveri from an ASUS CHVF-Z with a FX 8350 @ 4.8GHz and an ASUS HD 7870 DCII2GD5V2 vid card. I am running Dom Plat 2133MHz RAM @ 9, 11, 11, 31, 45 and planned on running same RAM with new setup.
Edited by edrak78 - 10/8/15 at 3:13am
post #1165 of 1334
Quote:
Originally Posted by Solohuman View Post


That's an interesting chart Himo5, but with that divider, how much Vdimm would be needed to maintain something like say 2496 or thereabouts? can these types of systems handle more than 1.65? and what about the latencies? Looks like we will have to use CL 13, 14, or even 15? seriously into DDR4 territory...

Come on AMD, get your desktop DDR4 systems up, running and for sale!! biggrin.gif

 

The DOCP profile for G.Skill 2666MHz/2x4Gb Dimms automatically raised NB Frequency to conform with the 1:1.25 ratio rule and DRAM Voltage is automatically set to 1.65V, but no other adjustments are necessary. The timings on which the chart was based support latencies running from CL7 to CL11, as can be seen at this link to how the chart was generated.

I have certainly heard of APUs being run with DRAM Voltage over 1.7V but DDR3 modules spec'd above 2400MHz are already binned to run at standard latencies. Because the Kaveri/Godavari Memory Controller cannot train memory frequencies above 2400MHz raising DRAM Voltage to such high levels is hardly necessary.

 

What CAN be done now that the price of high spec'd DDR3 has begun to plummet is to overclock it around the 2400MHz mark at ever tighter timings and see if reducing latency - perhaps even to DDR2 levels - may produce the same performance gains as increasing memory speed.

post #1166 of 1334
Tighter timings will help the CPU, but generally they will do nothing to help the iGPU.
post #1167 of 1334
Quote:
Originally Posted by edrak78 View Post

One question: how does the performance of a A10 7850 compare to a FX8350@ 4.8GHz and HD7870 GHz edition vid card? I was looking at going to an ASUS Crossblade Ranger and the 7850 Kaveri from an ASUS CHVF-Z with a FX 8350 @ 4.8GHz and an ASUS HD 7870 DCII2GD5V2 vid card. I am running Dom Plat 2133MHz RAM @ 9, 11, 11, 31, 45 and planned on running same RAM with new setup.
Are you asking how the integrated graphics on the 7850K compare to that setup or just the using the 7850K CPU vs 8350 with the HD7870?

Either way at 4.4Ghz the 7850K(CPU) will match the 4.8Ghz 8350 in up to 3 threaded heavy games, but the extra cores make the 8350 more useful in many other things.
even overclocked to the max the 7850K iGPU can never compete with an HD7870
Only reason to use a 7850K with an HD7870 would be to try DX12's ability to *crossfire* the 2 gpus. or if HSA suddenly became relevant rolleyes.gif
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post #1168 of 1334
7850K,

I was asking how they compared since i know the AM3+ only can use PCIE 2.0 and the FM2+ uses PCIE 3.0. I was wondering if using my HD7870 coupled with the 7850K would outperform my current rig.

PS.
I had to down-clock my 8350 to stock to keep windows 10 from crashing when playing crystal saga, but that may be because i changed PSUs for the computer; went from a Cooler Master Silent Pro Gold 1000W to a Corsair AXi 1200W and not sure if it is the PSU or an update from windows 10 that is causing the crashing.
Edited by edrak78 - 10/9/15 at 12:28am
post #1169 of 1334
Quote:
Originally Posted by edrak78 View Post

One question: how does the performance of a A10 7850 compare to a FX8350@ 4.8GHz and HD7870 GHz edition vid card? I was looking at going to an ASUS Crossblade Ranger and the 7850 Kaveri from an ASUS CHVF-Z with a FX 8350 @ 4.8GHz and an ASUS HD 7870 DCII2GD5V2 vid card. I am running Dom Plat 2133MHz RAM @ 9, 11, 11, 31, 45 and planned on running same RAM with new setup.
I think this single core benchmark comparison between FX4350@4.3 GHz and 860K@4.1 GHz - both with 270x - will help mitigate the hesitancy. [FX-4350], [X4 860K(Kaveri)]. Warning: Spoiler! (Click to show)


Edited by mtcn77 - 10/9/15 at 1:46am
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post #1170 of 1334
Quote:
Originally Posted by 7850K View Post

Are you asking how the integrated graphics on the 7850K compare to that setup or just the using the 7850K CPU vs 8350 with the HD7870?

Either way at 4.4Ghz the 7850K(CPU) will match the 4.8Ghz 8350 in up to 3 threaded heavy games, but the extra cores make the 8350 more useful in many other things.
even overclocked to the max the 7850K iGPU can never compete with an HD7870
Only reason to use a 7850K with an HD7870 would be to try DX12's ability to *crossfire* the 2 gpus. or if HSA suddenly became relevant rolleyes.gif

This says Windows 10 does some thing different with APUs, but what ? I did notice some improvement in overall performance boost with my A10-5750M notebook with win 10. But I don't game with it. I have a FX-9590 box Dual R9-285s for that. If AMD ? has come up with a trick in win 10 with a APU chipset that allows the CPU to be aided by the APU video processor and just let a 7870 do it that would be good thing. The 285 is close to the 7950 performance. I think crossfire (dual Graphics) with a APU would slow down a 7870. The reason I don't think it was just an AMD idea is intel has APU CPUs too, and is going to get better on the APU side in the future.

https://community.amd.com/docs/DOC-1312

I did find this

http://www.amd.com/en-us/innovations/software-technologies/technologies-gaming/dual-graphics
Edited by warpuck - 10/9/15 at 9:20am
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