Not much help, but...
Introduction Date:March 19, 2019Discontinued Date:August 4, 2020
Processors:1 (6 Cores)Architecture:64-Bit
Geekbench 2 (32):15108Geekbench 2 (64):17008
Geekbench 3 (32):3741Geekbench 3 (32):18077
Geekbench 3 (64):4490Geekbench 3 (64):21173
Geekbench 4 (SC):5203Geekbench 4 (MC):20649
Details:These Geekbench 4 benchmarks are are for a single processor core and all processor cores, respectively. All Geekbench 4 benchmarks are 64-bit. Both numbers reflect an average of user provided results as submitted to the Geekbench website. Higher numbers are better.
You also might be interested in reviewing all single core and multicore Geekbench 4 user submissions for Macs with the iMac19,1 Model Identifier, which may include multiple models.
To dynamically compare Geekbench 4 results from different Macs side-by-side, see EveryMac.com's Ultimate Mac Comparison.
Geekbench 5 (SC):1011Geekbench 5 (MC):4849
Processor Speed:3.0 GHzProcessor Type:Core i5 (I5-8500)
Details:This model is powered by a 14 nm, 64-bit "8th Generation" Intel Mobile Core i5 "Coffee Lake" (I5-8500) processor which includes six independent processor "cores" on a single silicon chip. Each core has a dedicated 256k level 2 cache, shares 9 MB of level 3 cache, and has an integrated memory controller (dual channel). It supports Turbo Boost up to 4.1 GHz.
This model does not have a T2 security chip.
https://everymac.com/systems/apple/imac/specs/imac-core-i5-3.0-27-inch-aluminum-retina-5k-early-2019-specs.html
Introduction Date:August 4, 2020Discontinued Date:N/A
Processors:1 (6 Cores)Architecture:64-Bit
Geekbench 2 (32):PendingGeekbench 2 (64):Pending
Geekbench 3 (32):PendingGeekbench 3 (32):Pending
Geekbench 3 (64):PendingGeekbench 3 (64):Pending
Geekbench 4 (SC):PendingGeekbench 4 (MC):Pending
Geekbench 5 (SC):1127Geekbench 5 (MC):5654
Processor Speed:3.1 GHzProcessor Type:Core i5 (I5-10500)
Details:This model is powered by a 14 nm, 64-bit "10th Generation" Intel Mobile Core i5 "Comet Lake" (I5-10500) processor which includes six independent processor "cores" on a single silicon chip. Each core has a dedicated 256k level 2 cache, shares 12 MB of level 3 cache, and has an integrated memory controller (dual channel). It supports Turbo Boost up to 4.5 GHz.
This model also has a T2 security chip.
https://everymac.com/systems/apple/imac/specs/imac-core-i5-3.1-6-core-27-inch-retina-5k-2020-specs.html