No. AMD has released an eight-core design, but that doesn't mean we have entered the "eight-core era." The FX-8xxx had a case for being an eight-core design - no one called that the beginning of the eight-core era.
As it stands now, we've arguably landed at six cores. AMD's Ryzen 5 1600X is...
I'm interested to see if someone manages to inject Coffee Lake microcode into Z170/Z270 motherboards or if Skylake/Kaby Lake gets injected into Z370 motherboards.
There are some extra voltage pins on Coffee Lake, but the fact it was tested on Z270 motherboards means that it can theoretically...
Unfortunately, it appears that Speed Shift was not working as intended.
As of right now, C-states and EIST are enabled. I was able to unhide a setting in Power Options called "Processor performance increase threshold" through some registry modification. This was set at 90% (meaning 90%...
I'll have to try this out. I found some hidden power management settings in Windows that have the same effect, but they don't function when Speed Shift is enabled.
The default threshold for changing P-states in Windows 10 was 90% utilization. That perfectly explains why benchmarks made my CPU...
Just upgraded from an i5-2500K at 4.4 GHz to an i7-7820X at 4.8 GHz. All benchmarks show that the processor is considerably more powerful than my 2500K.
The issue? Every day use seems sluggish. I've narrowed the problem down to the processor spending almost all of its time at 1.2 GHz - even up...
It's not using AVX. There's some specific combination the Prime95 26.6 blend throws at my CPU that pushes it to higher power draw than even Small FFTs does. Part of the power consumption (though likely insignificant) comes from the memory controller running at DDR4-4000 and the uncore/mesh...
Got my i7-7820X set up.
On an ASRock X299 OC Formula and NH-D15, I'm running it at 4.8 GHz/1.25V. Temperatures peaked at about 91C when open air testing. Testing with my case in my desk can force temperatures to almost hit 100C, so I've limited the long term boost power consumption limit.
This...
Correct, but are we simply accepting that the base case is true? Is there a reason we are considering 7900X vs. 7920X rather than 7800X/7820X? Or maybe 7740X/7800X?
If we really push it, we may be able to prove 28 cores = 0 cores by induction!
Almost, but not quite. We have failed to demonstrate a base case, so we can't really make use of this attempt at proof.
Perhaps we should attempt proof by contradiction?
Assume 12 cores are indistinguishable from 10 cores. This implies that $1199 = $999, which implies that 199 = 0. This is a...
While this is technically true, it ignores the fact that the "two generations" that came out on Z170/Z270 were fundamentally the same architecturally. At the very least, Ivy Bridge was a die shrink of Sandy Bridge with an improved memory controller.
Coffee Lake's cores are more similar...
There are no officially documented electrical differences as of now. The expectation of Skylake and Kaby Lake working on Z370 is simple - if it weren't compatible, we'd almost certainly see "for use on Z170/Z270 only" on Kaby Lake CPUs at this point.
Sometimes BIOS mods allow for this kind of...
There is official word. The boxes for Coffee Lake CPUs specifically state that Z370 motherboards are required.
Some people believe there's a genuine need for new motherboards to support these CPUs, but I'm not buying it. They aren't meaningfully different from Skylake/Kaby Lake in any way that...
It doesn't look like anything has really been changed with the PCH - Z370 looks to be just a Z270 rebrand. Z390 is going to be the new PCH. Socket power delivery looks like it is the only plausible explanation (and that's stretching it since people are pushing Kaby Lake to >7.0 GHz on LGA 1151...
You're right, but this ignores the fact that running Skylake/Kaby Lake at >5.0 GHz can easily push power consumption to >50% of stock consumption without issues with the socket delivering power. High-end motherboards can push Skylake/Kaby Lake to >7.0 GHz, which - without factoring in voltage...
A single 8-pin CPU connector is capable of delivering 288W, so my numbers were actually wrong. Two 8-pin connectors can theoretically provide up to 576W to the CPU.
This ignores the fact that Coffee Lake is painfully unlikely to use >50% more power than Kaby Lake or Skylake - the die isn't even...
Given that getting Z170 and Z270 to push more than 250W to the CPU with a good VRM and cooling isn't unusual? Yes. Yes I do.
There are Z170 and Z270 boards designed to provide up to 488W to the CPU. I don't think the i7-8700K is going to exceed that.
Just want to point out that having eight cores, ten cores, or 437 cores running at 90°C does not imply that a CPU is behaving as a "space heater." If you have a 1mm^2 die running at a constant 90°C, it isn't going to function as a space heater in any capacity. A 1000mm^2 die running at a...
Came to say 11% increase on single-threaded performance on the i7-8700K compared to the i7-7700K isn't going to happen, but it actually looks feasible if we assume linear scaling across the board.
The i7-8700K will turbo 4.44% higher than the i7-7700K, and its IMC can officially run RAM at an...
I'm not understanding what you're getting at then.
You believe Coffee Lake will bring higher IPC because of RAM bandwidth.
Kaby Lake and Skylake are already pushing up against the limits of DDR4, so Coffee Lake won't be able to provide higher bandwidth.
Now you say you don't care about...
Skylake could regularly hit 4133 MHz RAM frequency and Kaby Lake could regularly hit 4266 MHz on the right motherboards. You're unlikely to see Coffee Lake improve on that in any capacity just because DDR4 isn't going to go much further. As of now, only Samsung B-die appears to be able to...
Process iterations alone don't yield performance improvements. Broadwell and Skylake used the exact same process, while Kaby Lake modified the process, and Coffee Lake modifies the process as well.
I would expect no IPC gain. Higher memory works just as well on Skylake/Kaby Lake, so that's not...
There will be no IPC increase, only additional cores.
Traditionally, process refinements like Kaby Lake and Coffee Lake have been referred to as CPU stepping instead of new codenames. Skylake, Kaby Lake, and Coffee Lake are fundamentally the same architecture.
This is Intel essentially saying "there is no technical reason Coffee Lake won't work in Z270, but we're going to prevent it any way."
If that's not enough to convince anyone, be aware that Coffee Lake engineering samples were being used on Z170 and Z270.
You can also try driving your RAM speeds up a bit. Minimum framerates can be heavily affected by RAM bandwidth.
Triple channel DDR3-2133+ would be ideal, but I don't think the Nehalem nor Westmere IMCs are likely to handle that. See if you can manage DDR3-1866 - go higher if possible, of course.
When you run Prime95 for stability testing, be sure that you're using different versions.
26.6 is the last version to not support AVX
27.9 is the last version to not support AVX2
Use the current version for testing AVX2 workloads.
The point of testing this way is to make sure you're stable...
Well, as if the die failing to be cooled wasn't enough, apparently all of the motherboards have absolutely awful VRM cooling:
https://www.youtube.com/watch?v=f7BqAjC4ZCc
It isn't even easy to attribute this to cost savings - this can only be explained by being rushed to market.
You're right, the output voltage settings or readings could be wrong - it would be a bit more consistent with what we know about Intel's 14nm process.
Skylake-X cores are, in themselves, completely fine. The complicating factors seem to stack in a very negative way, though.
Poor IHS contact to...
Hardware Unboxed managed to cool a Core i9-7900X down a bit by using a gigantic radiator in a custom loop. Prior to using this huge radiator, they were pulling about 420W from the wall at 4.6 GHz - post custom loop (and lower temperatures), they were down to about 370W from the wall at 4.7 GHz...
Even today, an i7 920 shouldn't be giving you issues running at low settings. Consider trying to push it up to 20*200 for 4.0 GHz before you purchase a new CPU.
In all honesty, Nehalem at 4.0 GHz is still fine for 60 FPS.
Has anyone seen power consumption for a delidded Skylake-X running at more modest temperatures? I'm wondering if the ridiculous power consumption is a result of leakage caused by the high temperatures - which are caused by the IHS' poor contact to the die.
It just occurred to me how absurdly bad the value of the i7-7740X is.
The i7-7740X retails for $349.99. The i7-7800X is $389.99. Seems like you'd be a fool to not throw down the extra $40.
No, I don't think seeing 14nm+ hitting 5.0 GHz is "a bit of a stretch." 14nm+ has been able to hit 5.0 GHz fairly frequently with four cores. These CPUs will run at higher temperatures due to having more cores/higher power consumption, but they're primarily being limited by the fact Intel didn't...
Should run fine on high end air coolers if it works on AIOs. Every HEDT part has claimed to need water cooling, but top end dual tower coolers pretty consistently match or outperform 240mm AIOs and match 280mm AIOs.
That said, we have an eight core CPU hitting 5.0 GHz without being delidded...
Two observations here.
First, the two published reviews at the moment lead me to believe that the overclock were solely thermally limited, not limited by instability. Skylake-x cores tend to see reasonable gains all the way up to around 1.45v, so we could reasonably see these CPUs hitting...
If the clock speeds rumored are correct, does anyone else find it surprising how consistent clocks are on Zen cores?
It seems that almost every Zen core can reach between 3.9 GHz and 4.1 GHz. That's not particularly high, but it is extremely consistent. Haswell and Skylake were landing...
Initially, the answer appears to be "the larger L2 should easily compensate for the lack of L3 cache due to the considerably lower latency," but there's a bit more complexity.
Unless Intel has significantly altered their cache model, the L3 cache is still inclusive. This means that everything...
HEDT parts will generally hit lower clock speeds than desktop parts simply because they have more cores.
If each Skylake core Intel produces has a 95% chance of being capable of 4.8 GHz, then (assuming core clock yields are independent - likely not entirely true) a 4 core Skylake SKU would only...
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