Instances›AWS EC2›u-6tb1›u-6tb1.metal
Compute
vCPUs448
Memory6144 GiB
Mem / vCPU13.71 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-6tb1.56xlarge224 vCPU · 6144 GiB
u-6tb1.112xlarge448 vCPU · 6144 GiB
u-6tb1.metal448 vCPU · 6144 GiB
u-6tb1.metal

u-6tb1.metal is AWS's memory-optimized EC2 size at 448 vCPU and 6144 GiB. It runs on Intel Xeon Scalable (Skylake), and AWS introduced it in September 2018. Spot's largest VM is 16 vCPU and 128 GiB, so matching this instance would take 44 × 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.

Match qualityNo single-node equivalent

u-6tb1.metal is 448 vCPU and 6,144 GiB. The largest comparable Spot node is mh.vs1.2xlarge at 16 vCPU and 128 GiB, so matching it would take 44 of them. That maths works out, but 44 nodes is a redesign rather than a migration — a single block of 6,144 GiB does not survive being split across a network.

If you chose u-6tb1.metal because the work genuinely needs 448 cores and 6,144 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$0.924
US Central, Chicagono AWS region$0.924
US Central, Dallasno AWS region$5.764
Hong Kong$0.924
Sydney, Australia$0.924
London, UK$5.764
US West, San Jose$0.088
US Central, Dallas 2no AWS region$10.648
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 6144 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 6144 GiB of RAM
  • ●You want a single-machine Spot equivalent. At this size there is not one.
  • ●GPU or FPGA acceleration is needed
  • ●CPU-bound work. You are paying for memory this workload will not use.
  • ●More than 13.71 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.
Rackspace Spot sells spare capacity at market prices. You pay what the market decides, not a list price.
  • 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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