11th gen Intel CPU upgrade for EliteDesk 800 G6

[CostinG]

Hi all,

I'm trying to upgrade the CPU on my EliteDesk 800 G6 to a Intel 11th gen CPU, the 11900 model in particular. The chipset on the motherboard is Q470 that the new CPU should work with (according to specs on both the Q470 and on the box of the 11th gen i9). But the machine doesn't boot with the new CPU, the power LED turns on but the screens don't receive any signal and in ~10seconds the fan starts spinning fast as if overheating.

The BIOS on this machine doesn't have many options and I haven't found anything there that might help. From what else I've found online it seems that either a firmware update might be needed, or a BIOS option to disable CPU_ID checks in the Intel Management Engine.

Apart from waiting and hoping for a BIOS firmware update from HP, do you have any other suggestions on what I could try?

For the reference the current CPU is a 10500 and both CPUs have the same power specs (65W).

Cheers,

.costin

[CostinG]

Status update. Just tried the latest firmware update (BIOS 02.06.02 Rev.A / May 31, 2021). The 11900 CPU is still not recognized.

[BambiBoomZ]

CostinG,

Checking Passmark baselines, there are 789 HP EliteDesk 800's of series G1 to G5 tested- there are no G6 systems listed.  Of the 789 baselines, there is one i9- CPU tested, an i9-9900T which has a 35W TDP.

Noting the HP sales specification, there are no i9-11th series CPU's listed; the highest series is i7- 11th series. Of the 789 systems there are only three systems with 8-cores, the remainder have 6 or 4-cores.

This is not proof that the i9-11900 is not compatible, but suggests a direct query to HP support or sales may be necessary to resolve the question definitively. Guessing;  In the smaller form factor cases, this may exceed a thermal limit under sustained 100% load as the number of cores in the same volume represents a considerably higher density for heat dissipation.

Off topic: [The HP EliteDesk 800 appears to an attractive package- compact and power efficient. Over time has specified some of the fastest- single-thread performance  CPU's and the larger form factor systems can use strong GPU-s- a good 3D CAD system for example. The highest rated one on Passmark having an i7-8700 (6C@ 3.2/4.4GHz ) / RT0X 2080/ Samsung PM981 512GB NVMe  has a system Rating of 7076.  See the Passmark listings for the z620 and z420 systems here, keeping in mind that the z420 had a rating of 6227- the highest 0f the 1,556 systems tested and the z620 of 6322 the second highest of 1,002 tested. ]

BambiBoomZ

HP z620_2 (2017) (R9) > Xeon E5-1650 v2 (6C@ 4.4GHz) / z420 Liquid Cooling / 64GB (HP/Samsung 8X 8GB DDR3-1866 ECC registered) /GTX 1070 Ti 8GB / Samsung SM951 M.2 512GB AHCI + Samsung 970 EVO M.2 NVMe 500GB + HP/HGST Enterprise 6TB / Focusrite Scarlett 2i4 sound interface + 2X Mackie MR824 / 825W PSU / Windows 7 Prof.’l 64-bit (HP OEM) > 2X Dell Ultrasharp U2715H (2560 X 1440)

[ Passmark Rating = 6148 / CPU rating = 15952 / 2D = 787 / 3D= 13077 / Mem = 3045 / Disk = 15506 / Single Thread Mark = 2425 [5.20.21]

HP z420_3: (2015) (R12) Xeon E5-1650 v2 (6C@ 4.3GHz) / z420 Liquid cooling / 64GB (HP/Samsung 8X 8GB DDR3-1866 ECC registered) / NVIDIA GeForce GTX 1060 6GB/ Samsung SM951 M.2 256GB AHCI + Samsung 860 EVO 500GB + HGST 7K6000 4TB / ASUS Essence STX + Logitech z2300 2.1 / 600W PSU > Windows 7 Professional 64-bit (HP OEM ) > Samsung 40" 4K

[Passmark System Rating: = 5947 / CPU = 15268 / 2D = 773 / 3D = 11025 / Mem = 2931 Disk = 15530 /Single Thread Mark = 2383 [5.3.21]

HP ZBook 17 G2: (2015 ) i7-4940MX Extreme (4C@3.1/ 4.0GHz) / 32GB / Quadro K3100M 4GB / Kingston 480GB SATA SSD > 17.3" LCD 1920 X1080 panel > HP docking station> video externally to HP 2711x 27" LCD + Dell 17" (2007) / Logitech 533 _2.1 speaker system

[Passmark System Rating: = 3980 / CPU = 10140 / 2D = 618 / 3D = 2779 / Mem = 2559 Disk = 4662 / Single Thread Mark = 2387 [1.3.20]