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[Anandtech] AMD Launches Excavator on Desktop: The 65W Athlon X4 845 for $70 - Page 6

post #51 of 147
Quote:
Originally Posted by Pro3ootector View Post

I wonder what this Athlon does... . AMD claims that despite maximum TDP of 65W in real world this chip rarely reach that limit.
According to AMD Excavator is around 40% more efficient than Steamroller cores, with more IPC.
You have ZEN and Excavator mixed up my friend. Zen has the 40% IPC improving while Excavator has probably a 5-15% IPC improvement over SR.
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post #52 of 147
Very odd that it has the same number of cores as the Steamroller models yet no iGPU and still has a TDP of 65? Along with a 95w stock cooler? and with lower clock speeds than the Steamroller APUs. Considering Exvacator was supposed to be significantly more efficient while also a little bit more powerful this doesnt seem to make much sense.
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post #53 of 147
Quote:
Originally Posted by EniGma1987 View Post

Very odd that it has the same number of cores as the Steamroller models yet no iGPU and still has a TDP of 65? Along with a 95w stock cooler? and with lower clock speeds than the Steamroller APUs. Considering Exvacator was supposed to be significantly more efficient while also a little bit more powerful this doesnt seem to make much sense.

Excavator was power-optimized for 35W and below TDP, above 35W TDP the power curve gets insane and it becomes less efficient than Steamroller at equivalent clocks.
post #54 of 147
Well, if anandtech's cpu bench can be considered relevant in this question, than that tool doesn't show much difference between an A10-6800K and a FX-4350

However I was wrong before. Stripping L3 while further lowering IPC, would only allow 50% more cores on the same area
post #55 of 147
Quote:
Originally Posted by Petykemano View Post

Well, if anandtech's cpu bench can be considered relevant in this question, than that tool doesn't show much difference between an A10-6800K and a FX-4350

However I was wrong before. Stripping L3 while further lowering IPC, would only allow 50% more cores on the same area

You have to know that APu has more of L$ than i3 - but i3 has faster cache.
FX 4350 has a lot of cache and you would notice it when you would be doing some serious multitasking, but in gaming it may be like 10% difference.
something like this:
https://www.youtube.com/watch?v=lHM-LBtJc2Q



steamroller vs piledriver
http://blackholetec.com/main/article/amd-a10-7850k-kaveri-review-page-7

A10 7850K/Athlon 860K GTX 980 Battlefront.
https://www.youtube.com/watch?v=CIWoXCohF7c
Edited by Themisseble - 2/2/16 at 2:30pm
post #56 of 147

very interesting however I was hoping for an AM1 cpu :D

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post #57 of 147
AM1 did get a refresh part today in the form of a 2.2ghz chip, I believe.

Am1 would've gotten 20nm successor to Kabini maybe at some point but it got canned.
post #58 of 147
Quote:
Originally Posted by NaroonGTX View Post

AM1 did get a refresh part today in the form of a 2.2ghz chip, I believe.

Am1 would've gotten 20nm successor to Kabini maybe at some point but it got canned.

they're still somewhat slow though, IPC is pitifully lower than bulldozer.

though it would've been great if they made an 8core chip of that, like intel's avoton processor.
post #59 of 147
Quote:
Originally Posted by Robenger View Post

One article I read thinks that these are just mobile parts, hence why there is only 8 lanes.

Quote:
Originally Posted by CynicalUnicorn View Post

I suspect that's due to Carrizo being Carrizo and not to differentiate the new SKU. Does anybody know how many lanes full Carrizo supports? It's a SoC for low-power laptops, so I'm not really sure it needs anything.

Ah, makes sense, using defective or not up to par mobile parts where either the GPU is faulty or it can't meet the TDP.

I was mixing it up with the upcoming Bristol Ridge APU that has Excavator cores. That one does have 16 lanes of PCIe.

The Athlon X4 845 will do fine with 8 lanes though, considering the typical GPU people will pair them with. A high-end GPU would be bottlenecked by the CPU before being bottlenecked by the lack of PCIe lanes.


Quote:
Originally Posted by jsc1973 View Post

Probably not as well. Any L3 cache, even a dog-slow one like in the K15h FX and Optys, will improve performance on server workloads. L3 cache was used in a lot of server CPU's long before it ever showed up in consumer chips. Intel was using L3 in Netburst Xeons 15 years ago, and it had appeared in non-x86 server chips long before that.

AMD never would have made Optys without L3 cache. They wouldn't have been any good. And it was cheaper to just make everything based on the Opteron design than to have a separate mask and production run for consumer chips without the L3.

No consumer chip used L3 until the AMD K6-III came out in 1999, and its L3 was motherboard-based. After that, it didn't appear again until the x86-64 multi-core era.


Small correction regarding your last sentence: actually it did show up in a consumer chip earlier than that, in the form of the socket 478 Pentium 4 Extreme Edition 3.2 Ghz, launched in 2003 (and then the 3.4 Ghz version in early 2004).

The chip was essentially a Gallatin based Xeon that Intel used to try to fight the Athlon 64 in the consumer space, so I see where you're coming from. Some people called it the Pentium 4 'Emergency Edition'. The 2 MB L3 cache (in addition to Northwood's 512 KB L2, which is what the chip is based on) did help it gain some fps in games but some productivity software was a little slower because of the added latency (but not much). It wasn't enough to fight the Athlon 64 though.
Edited by tpi2007 - 2/2/16 at 5:16pm
 
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post #60 of 147
on-die cache may be good and all, but off-die cache can replace the L3 cache.
intel had attempted an L4 off-die cache (eDRAM) and its very successful, the only issue it had is that it costs quite a bit.

but with HBM and/or HMC available, they can mitigate the cost of die with minimal sacrifice to bandwidth and latency.
they can thus make the die itself cheaper (smaller dies have better yields per wafer).
Quote:
Originally Posted by tpi2007 View Post

The Athlon X4 845 will do fine with 8 lanes though, considering the typical GPU people will pair them with. A high-end GPU would be bottlenecked by the CPU before being bottlenecked by the lack of PCIe lanes.
x8 would be fine if its only a single add-on card, in this case a mid-tier GPU.
but what about adding a high-speed SSD (M.2 or PCIe) which requires 3.0 x4?

can anyone confirm whether this CPU has enough lanes to support a fully populated MATX board?
the UMI interconnect of the FM2 chipset only has 2.0 x4 (2GB/s) worth of bandwidth by itself, shared by LAN, USB, SATA, etc.
Edited by epic1337 - 2/2/16 at 5:34pm
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