Discussion Qualcomm Snapdragon Thread

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FlameTail

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Someone on Twitter pre-ordered just as soon as the pre-order page came up - and got July 3 ship date. (From Dell)
Yeah, Dell seems a bit sluggish. They haven't even added the Tandem OLED option to their new Snapdragon XPS 13 configurator.
 
Jul 27, 2020
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1716553417563.png

Yoga Slim 7x (14", Gen 9)​


Lenovo inviting mobile warriors to sell their organs to afford their swanky new laptop!

EDIT: Sorry. Google thought it would be funny to show me the Lenovo New Zealand site.
 
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poke01

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So let me get this straight (please tell me I’m wrong), the highest SKU the -84 model is locked to Samsung but Samsung maxes out their laptop at 16GB RAM and uses eUFS storage.

Like who is laptop even for???
Not surprising that’s the angle taken given it’s Tom Warren writing that lol
no surprise there. Thank goodness, Neelay is editor in cheif for the Verge. Neelay while not perfect, he’s not a total Microsoft fan.
 

StinkyPinky

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So let me get this straight (please tell me I’m wrong), the highest SKU the -84 model is locked to Samsung but Samsung maxes out their laptop at 16GB RAM and uses eUFS storage.

Like who is laptop even for???

no surprise there. Thank goodness, Neelay is editor in cheif for the Verge. Neelay while not perfect, he’s not a total Microsoft fan.

Samsung have a weird phobia about having 32gb ram on their laptops.

Sometimes they sell the same models in their business part of the website with higher specs if you're lucky.
 
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FlameTail

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How'd you get that?

I am seeing this:

View attachment 99579
This Yoga in fact, seems to be one of the best Snapdragon X PCs that have been announced recently out of all the OEMs.

The specs are excellent for the price (16 GB/1 TB/X Elite/OLED). The battery life is going to be amazing becuase of that 70Wh pack, and all that packed into a slim and lightweight 14" chassis.
 

FlameTail

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There is also the Acer laptop


I have never used Acer though and generally consider their monitors low end quality. That's just me.
Idk about Acer. My impression is that their products are generally lower quality and less reliable.

The Lenovo Yoga on the other hand, is a premium and established line.
 
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Idk about Acer. My impression is that their products are generally lower quality and less reliable.
I have used an Acer Core Duo laptop for almost two years. It was great and I had no complaints. No idea about any of their recent products but their Swift line of laptops is reasonably successful.
 

poke01

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The lower end models get a less powerful GPU. No OEM mentions this, no TFLOP count or core count are listed.

4.6TFLOPS vs 3.8TFLOPS
 

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FlameTail

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The lower end models get a less powerful GPU. No OEM mentions this, no TFLOP count or core count are listed.

4.6TFLOPS vs 3.8TFLOPS
It probably doesn't matter that much I suppose, becuase the 20% better performance of the 4.6 TFLOPS comes with 50% higher power consumption (20W -> 30W), as per Qualcomm's official graphs.

Which means the 3.8 TFLOP GPU was obtained by reducing the clock speed, not bt disabling ALUs. The Android Authority leak also said this, further going to say that the 3.8 TFLOP is clocked at 1.25 GHz, and the 4.6 TFLOP at 1.5 GHz.

It's interesting that Qualcomm doesn't do any horizontal binning* (ie: disabling cores). They have always relies on vertical binning* (ie: reducing clock speeds). The X Plus having a cut down 10 core CPU might be the first time in recent memory, that Qualcomm is doing horizontal binning.

This is in stark contrast to Apple. Apple exclusively uses horizontal binning, not vertical. Whether you get the 9-core M4 or 10-core M4, they both run at the same clock speed. This is even true for their iPhone SoCs (example: A15 Bionic 4-core GPU vs 5-core GPU versions).
 

Nothingness

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FlameTail

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Here's what we can infer about the cache hierarchy of X Elite/Plus.

1. The "42 MB Total Cache" advertised by Qualcomm doesn't include L1.
SNAPDRAGON-X-ELITE-PLUS-SPECS-e1713878672371.jpg
How do we know this? By looking at the above chart. The X Elite (12 core) and X Plus (10 core) both have that 42 MB listed. That means L1 is certainly not included in the 42 MB figure, becuase 12 core -> 10 core bin will also disable some of the L1. Hence both X Elite and X Plus wouldn't be advertised as 42 MB Total Cache.

2. The CPU does not have L3 cache. This was already guessed back then, as we know that the Oryon CPU is designed by Nuvia engineers, a part of whom hail from Apple. Thus it is expected that Oryon would have similarities to Apple CPUs, which do not have L3 cache.

But we dont have to guess anymore, becuase we have confirmation from the above screenshot of the task manager. Only lists L1 and L2 are listed. No L3.

3. The CPU has 36 MB of L2; distributed as 12 MB per core cluster. Each cluster has 4 cores, and there are 3 clusters, which make up the 12-core CPU. This information was disclosed by a Qualcomm executive in an interview last year.

4. We know the L1 is not included in the "42 MB Total Cache". 36 MB is L2. That leaves 6 MB (42-36 = 6) to be accounted for. We can easily infer that the 6 MB is the SLC (System Level Cache).

5. The above posted task manager screenshot divulges that the CPU has 2.8 MB of L1. Now, that is spread across 10 cores. So that means 280 KB per core.

280 KB is a strange figure. Does task manager round off cache numbers? Maybe it's actually 2.88 MB, which works out to 288 KB per core.

So we can summarise it as follows:

Snapdragon X Plus (Oryon core)
L1 : 280 KB (?)
L2 : 12 MB
SLC : 6 MB

For comparison, Apple M3 (P-core);
L1 : 320 KB (192 KB L1i + 128 KB L1d)
L2 : 16 MB
SLC : 8 MB
 

Nothingness

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Since we're doing wild guessing, here's something that matches 2.8 MB: 2x128 KB L1 + 2×16 KB L0. Or 32 KB uop cache. Anyway 2.8 MB = 10x288 KB, not 10x280 KB.

I still have my doubts about that 2.8 MB figure.
 
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