Instances›AWS EC2›u-12tb1›u-12tb1.112xlarge
Compute
vCPUs448
Memory12288 GiB
Mem / vCPU27.43 GiB
ProcessorXeon Scalable
Clock speedN/A
Architecturex86_64
Storage
TypeEBS only
BandwidthN/A
ThroughputN/A
IOPS0
Networking
Performance100 Gigabit
Max ENIsN/A
IPv6Yes
GPUNone
Family sizes
u-12tb1.112xlarge448 vCPU · 12288 GiB
u-12tb1.metal448 vCPU · 12288 GiB
u-12tb1.112xlarge

u-12tb1.112xlarge is AWS's memory-optimized EC2 size at 448 vCPU and 12288 GiB. It runs on Intel Xeon Scalable (Skylake), and AWS introduced it in May 2021. Spot's largest VM is 16 vCPU and 128 GiB, so matching this instance would take 88 × mh.vs1.2xlarge — arithmetically true and operationally absurd. The Spot column below prices that whole fleet, so read it as a scale reference rather than a drop-in replacement: at this size the useful question is what a shard of the workload costs, which is $0.021/hr per node.

Match qualityNo single-node equivalent

u-12tb1.112xlarge is 448 vCPU and 12,288 GiB. The largest comparable Spot node is mh.vs1.2xlarge at 16 vCPU and 128 GiB, so matching it would take 88 of them. That maths works out, but 88 nodes is a redesign rather than a migration — a single block of 12,288 GiB does not survive being split across a network.

If you chose u-12tb1.112xlarge because the work genuinely needs 448 cores and 12,288 GiB together — an in-memory database, a large analytics engine, a single big solver — Rackspace Spot has no equivalent. What does fit is everything around it: the application servers, batch workers and CI that talk to that machine, which is usually the larger share of the bill.

Pricing by region
1 hr
RegionAWS on-demandAWS Spot1-yr Reserved3-yr ReservedRackspace SpotYou save
US East, N. Virginia$109.200$1.848
$107.352 savings
US Central, Chicagono AWS region$1.848
US Central, Dallasno AWS region$11.528
Hong Kong$1.848
Sydney, Australia$130.867$1.848
$129.019 savings
London, UK$11.528
US West, San Jose$0.175
US Central, Dallas 2no AWS region$21.175
When to use it
Good for
  • ●OLAP and business intelligence query engines
  • ●Real-time analytics over hot datasets
  • ●Database instances that keep the working set in RAM
  • ●Workloads that fit inside 12288 GiB of RAM
  • ●Parallel work that can occupy 448 vCPU
  • ●Network-heavy services — AWS rates this size at 100 Gigabit
Avoid if
  • ●The working set needs more than 12288 GiB of RAM
  • ●You want a single-machine Spot equivalent. At this size there is not one.
  • ●More than 27.43 GiB of RAM per vCPU is needed — that ratio is fixed for the whole family
  • ●The work is single-threaded. Most of these 448 vCPU would sit idle.
  • ●Local NVMe or instance-store disk is a hard requirement
  • ●GPU or FPGA acceleration is needed
u-12tb1.112xlarge is $79,716/mo on AWS on-demand. A mh.vs1.2xlarge node on Rackspace Spot is $15/mo — at this size the per-node price is the honest comparison.
  • Spot sells spare capacity at market prices. It is the cheapest compute on the internet.
  • Prices are set by supply and demand. You pay what the market decides.
  • Compute is delivered as fully managed Kubernetes. All infrastructure is taken care of.
  • Egress costs $0.01/GB after the free allowance. AWS charges $0.09/GB.
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