already upgraded mine and huge difference. No disconnect issue at all. Only problem is sometimes asus router need to factory reset to login inside the router.

LOL then it should be router issue already.

My Old TP Link Archer C7 V2 cannot go beyond 400mbps download as well. Need to upgrade to Asus RT86U and finally can hit 800+ mbps download.

I see, I might get an asus too.
I'm already looking for a new one right now. I just wanted confirmation from DIR-850L turbo'ed users before I blindly buy a new one and turns out the problem is on unifi's end.
But damn. these router companies, advertising their 'gigabit' routers that can't even achieve 800mbps on wired connection .

have u upgraded your router already? any difference?
Yep I know my upload speed is fine, but I can't get past 302Mbps download speed on speed test on cat6 wired.

walao 
and im paying RM179+ST for 500 

As John said, it might not be related to router issue. Suggest u restart in safe mode with networking and rerun speedtest app. That's the quickest way to diagnose if it's a computer related microcode throttling or just a computer issue vs a router issue.

I am also limited by this microcode issue. 800Mbps but typically about 720Mbps using edge browser, 660-700Mbps using app or chrome browser. In safe mode with networking easily able to hit 820Mbps download and 220Mbps upload speeds.

......You sure it is not your PC issue? The microcode or heat related issue?

I got one 850L and it can get 500Mbps just fine via wired.

TM AGENT Hi, thank you for waiting. I'm TM AGENT SUZIYANA. How may I assist you?
customer hi
customer 102xxxxxx
customer my account for unifi
customer when can be turbo? or not entitled to turbo?
customer this is high rise condo unit
customer hello??
TM AGENT may i know this account registered under whose name ya?
customer my name
TM AGENT thank you for verification
TM AGENT for free upgrade may depend on network and technical availability
TM AGENT your premise type max speed 30mb
customer so how?
customer am i entitled for lower price?
customer since my speed can't be upgrade
customer new package is 100mb 129
customer i'm paying 189
TM AGENT only avalaible for 30mb rm79 got quota
customer 30mb
customer come on
customer maxis is 89/30mbps
TM AGENT may depend on network and technical availability
customer if i can't get 100mbps rm129
TM AGENT if you stillw ant 100mb rm129 i will assign our team to check first
customer no need check
customer i have neighbour already on that plan *tipu**
customer u can check on ur system
customer Unifi Portal changed from "Unifi Advance 30 Mbps" to "Unifi 30Mbps non-fiber plan
customer rm119
TM AGENT ya if you insist that plan need assign for our team
TM AGENT to check what offer can give you
customer when can let me know
TM AGENT within 7 days
customer ok any report number?
damn these tm customer service never really appreciate their customer...

wait what?

Yeah the PC i'm testing on is quite old, it's an i7 4770k . But it's water cooled inside a mid tower case with 3 front intakes and 3 exhaust fans i'm sure it's not that hot inside if that's what you meant by heat.

I have no idea what microcode issue is, what is it?

To disable Variant 2: (CVE-2017-5715 – "Branch Target Injection") mitigation:

reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management" /v FeatureSettingsOverride /t REG_DWORD /d 1 /f

reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management" /v FeatureSettingsOverrideMask /t REG_DWORD /d 3 /f

To enable Variant 2: (CVE-2017-5715 – "Branch Target Injection") mitigation:

reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management" /v FeatureSettingsOverride /t REG_DWORD /d 0 /f

reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management" /v FeatureSettingsOverrideMask /t REG_DWORD /d 3 /f

reg add "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Virtualization" /v MinVmVersionForCpuBasedMitigations /t REG_SZ /d "1.0" /f

Speaking of which.....how about your Alienware 15 R1?
Because you had updated the laptop to latest firmware which contain the problematic 0x24....., you have no choice but to disable spectre mitigations via registry method.

Renaming the mcupdate will not work for your case.

Yeah...will need to get to registry fix as u recommended but hv not done so yet. The thing is for now I get max 200Mbps anyway for foreign sites and for local it's almost 700Mbps..I really don't see a need to fix it...need to get it done one of these days. There does seem to be some some throttling of speeds to US or EU..do u see the same?

Double your speed and save 70 RM! Switch!

was thinking on doing but since the announcement turbo-ed by end of Jan 19, few months away..
i can wait..
though my current tp link on cable max 100mbps but wifi can support up to 500mbps..

Why on LAN can support lesser than WiFi?

Anyone else here still using DIR-850L router with 500/800Mbps turbo?

I can't get past 305Mbps on speedtest, I tried multiple speedtest sites, downloaded few stuffs. But the max download speed I get is only 39mb/s.

My connection is wired, Cat6 ethernet cab.

This is a gigabit router. It's supposed to be able to achieve gigabit speed on wired, but I don't think so anymore. I need confirmation on DIR-850L turboe'd user before I bin this thing.

was thinking on doing but since the announcement turbo-ed by end of Jan 19, few months away..
i can wait..
though my current tp link on cable max 100mbps but wifi can support up to 500mbps..

As John said, it might not be related to router issue. Suggest u restart in safe mode with networking and rerun speedtest app. That's the quickest way to diagnose if it's a computer related microcode throttling or just a computer issue vs a router issue.

=.=...........you know what....let just move straight to the possible fix.....

CVE-2017-5715 (Spectre Variant 2)
First, open a command prompt, copy paste above, disable the spectre mitigation,reboot and rebenchmark.
You can always re-enable it again....in the future?
Reboot is mandatory.

like you said, I went to safemode with network, the upload speed is always 204mbps.

ookla chrome 88mbps
tmspeedtest chrome 301mbps

ookla chromium 90mbps,
tmspeedtest chromium 302mbps

ookla opera 87mbps
tmspeedtest opera 302mbps

ALSO I tested my Cat5e cable too, switching ethernet ports with my Cat6 cable, same results.
I did a little bit of googlin and went through regedit, cpu-z validator. I don't have spectre mitigation enabled, It's not even patched cuz I never update my windows  .

should I just give up and call TM to send their technician over?