The Official Kaveri Review Thread (A10-7850K, etc)

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monstercameron

Diamond Member
Feb 12, 2013
3,818
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wtf man, newegg guys are giving out bf4 coupons but only with a $600 combo. I though it came just with the APU...le sigh.
 
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Enigmoid

Platinum Member
Sep 27, 2012
2,907
31
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Erenhardt said:
But that way you are getting even slower CPU - which seems everyone have a problem with, not the graphics.

On top of that getting kaveri you may go dual graphics, and suddenly R7 250 (7730) is performing like 7770.
A8-7600 looks like a good deal. 7850k not so much.
Click to expand...

I thought the rule of thumb was to avoid crossfire/SLI unless you couldn't. 760k can be overclocked (a8-7600 cannot) on the stock cooler a fair deal. Besides if you are playing just games then neither CPU is going to limit you (unless something unreasonably CPU heavy like GW2 but then neither CPU can handle that game well).

Gikaseixas said:
Here some tests from Hardware Canucks (BF4 included). Best CPU with iGPU period





Click to expand...


Barely faster than previous gen?

Also the a10-6800k vs. a10-5800k seems weird. Added 44 mhz (800 -> 844 =5.5%) clockspeed on a memory limited system and got 22/27/12% fps increases. Seems legit.

(They are using nvidia driver 306.23 for their dgpu tests. Almost all of their dgpu tests are the worthless kinds; 200+ fps).
 
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DrMartin

Junior Member
Jan 15, 2014
1
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I think about Kaveri and dual graphics properties and TWO R7 250 in Crossfire? Would it be a "triple crossfire" and how it will perform? We are talking about 2500 GFLOPS ...

What about this combination? What would be the proper mobo with A10 7850k with two R7-250 in crossfire?



And what about a 7850k with four R7-250 in quad crossfire in a ASUS A88X motherboard? x5 crossfire? x5 scalability ? (4300 GFLOPS aprox) as nVIDIA GTX TITAN (4200 GFLOPS)

The price of the 7850K processor + four R7-250 + A88x motherboard (4300 GFLOPS for 480EUR!!!)...... a half of a SINGLE nVIDIA GTX TITAN (4200 GFLOPS) (900 EUR)!!!!!!!!!!

The scalability of 7850k + an external R7 250 chip with GDDR5 is awesome ...

http://www.hardware.fr/articles/913-10/gpu-dual-graphics-jeux.html
 
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Silverforce11

Lifer
Feb 19, 2009
10,457
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LfkOQQx.jpg


There is definitely a case for going with AMD's APU even with a discrete class of 7750 / R250.

Dual Graphics (DG in the charts), getting nearly 60 fps in BF4 on medium for such a cheap rig is amazing.
 
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Homeles

Platinum Member
Dec 9, 2011
2,580
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Have there been any frame latency tests done with asymmetric crossfire? That's what I'm concerned about. Really hope that's nailed down.
 
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Enigmoid

Platinum Member
Sep 27, 2012
2,907
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Silverforce11 said:
Barely faster? Going from 31fps to 37fps in BF4 at 1080p is a big deal. On crippled 1600mhz ram.
Click to expand...

While a nice improvement and the difference between barely playable and okay its minimal for the hardware improvement involved. BF4 is also the largest gain in any game I've seen. It also appears like different drivers were used which is a problem (like when haswell was released the new drivers gave a massive boost to HD 4000).

Silverforce11 said:
LfkOQQx.jpg


There is definitely a case for going with AMD's APU even with a discrete class of 7750 / R250.

Dual Graphics (DG in the charts), getting nearly 60 fps in BF4 on medium for such a cheap rig is amazing.
Click to expand...

Toms already did a review of hybrid crossfire showing that average fps was worthless. Unless AMD fixes their drivers effective FPS is probably the same to slightly better than the APU alone.

http://www.tomshardware.com/reviews/dual-graphics-crossfire-benchmark,3583-4.html
 
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Silverforce11

Lifer
Feb 19, 2009
10,457
10
76
Enigmoid said:
Toms already did a review of hybrid crossfire showing that average fps was worthless. Unless AMD fixes their drivers effective FPS is probably the same to slightly better than the APU alone.

http://www.tomshardware.com/reviews/dual-graphics-crossfire-benchmark,3583-4.html
Click to expand...

Richland and Llano were on older VLIW arch, without the new CF improvements in hardware in CGN 2.0, as we've seen from all the reviews, GCN 2.0 in CF have very good frame latency.

We will have to wait and see if a review site does a proper review of the new DG mode for Kaveri. If it maintains the frame pacing improvements, then its an awesome alternative for a cheap gaming rig.
 
W

Wall Street

Senior member
Mar 28, 2012
691
44
91
Dual channel 1600 Mhz DDR3 has 25.6 GB/s of bandwidth. The GDDR5 in the HD 7750 has 72 GB/s bandwidth. I wonder where this APU market is headed. Pretty soon AMD will have to do one of the following:

1. Make an on-die cache that can hold an entire frame buffer.
2. Make an off-die fast memory like Iris Pro or XBone.
3. Resort to 3-4+ channel memory controllers.
4. Offer boards with GDDR5 mounted next to the APU like the PS4.

Given that they need a doubling of bandwidth, I don't see fast DDR3 or even DDR4 as being a good answer for the future of APUs. I see where there is a value angle here, but I really can't recommend a graphics subsystem with less memory bandwidth than a HD 5570 in 2014 (and THAT bandwidth is shared with the CPU cores). If you can buy the games and are getting a new system, you should at least spring for the Pentium G3220 and HD 7750 - the gulf in performance is just too large not to step up.
 
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monstercameron

Diamond Member
Feb 12, 2013
3,818
1
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Wall Street said:
Dual channel 1600 Mhz DDR3 has 25.6 GB/s of bandwidth. The GDDR5 in the HD 7750 has 72 GB/s bandwidth. I wonder where this APU market is headed. Pretty soon AMD will have to do one of the following:

1. Make an on-die cache that can hold an entire frame buffer.
2. Make an off-die fast memory like Iris Pro or XBone.
3. Resort to 3-4+ channel memory controllers.
4. Offer boards with GDDR5 mounted next to the APU like the PS4.

Given that they need a doubling of bandwidth, I don't see fast DDR3 or even DDR4 as being a good answer for the future of APUs. I see where there is a value angle here, but I really can't recommend a graphics subsystem with less memory bandwidth than a HD 5570 in 2014 (and THAT bandwidth is shared with the CPU cores). If you can buy the games and are getting a new system, you should at least spring for the Pentium G3220 and HD 7750 - the gulf in performance is just too large not to step up.
Click to expand...


what about less but more powerful shaders? wouldn't that decrease the need for very high amounts of bandwidth?
 
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Silverforce11

Lifer
Feb 19, 2009
10,457
10
76
Wall Street said:
Dual channel 1600 Mhz DDR3 has 25.6 GB/s of bandwidth. The GDDR5 in the HD 7750 has 72 GB/s bandwidth. I wonder where this APU market is headed. Pretty soon AMD will have to do one of the following:

1. Make an on-die cache that can hold an entire frame buffer.
2. Make an off-die fast memory like Iris Pro or XBone.
3. Resort to 3-4+ channel memory controllers.
4. Offer boards with GDDR5 mounted next to the APU like the PS4.
Click to expand...

I would love to buy a custom board with GDDR5 and an APU as powerful as the PS4, 7850 class is too good in an APU. Imagine the slim and powerful SFF builds.
 
J

jpiniero

Lifer
Oct 1, 2010
16,989
7,394
136
I imagine they will pursue something similar to stacked DRAM like what nVidia is doing with Volta.
 
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Wall Street

Senior member
Mar 28, 2012
691
44
91
monstercameron said:
what about less but more powerful shaders? wouldn't that decrease the need for very high amounts of bandwidth?
Click to expand...

I don't think so. At the end of the day, everything needs to be loaded before it is processed and saved after it is processed. Shaders need to be"fed" by the memory controller.
 
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Enigmoid

Platinum Member
Sep 27, 2012
2,907
31
91
monstercameron said:
what about less but more powerful shaders? wouldn't that decrease the need for very high amounts of bandwidth?
Click to expand...

I'm not sure and its too early to tell but this whole APU business could be hamstrung by bandwidth right from the start; drastically limiting compute.
 
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positivedoppler

Golden Member
Apr 30, 2012
1,148
256
136
Thanks everyone. Wow that's pretty freaking impressive. Does it mean once Mantle version is released those numbers goes up even higher?
 
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