dreambooth显存占用

dreambooth显存占用是不是挺大的，训练一个512大小得图，4张p40 24G显卡都不够，这个正常吗

batch_size: 1
resolution: (256, 256)
enable_bucket: True
network_multiplier: 1.0
min_bucket_reso: 256
max_bucket_reso: 512
bucket_reso_steps: 64
bucket_no_upscale: False

[Subset 0 of Dataset 0]
image_dir: "lora-scripts/imgs/7_zkz/7_zkz"
image_count: 1
num_repeats: 7
shuffle_caption: True
keep_tokens: 0
keep_tokens_separator:
secondary_separator: None
enable_wildcard: False
caption_dropout_rate: 0.0
caption_dropout_every_n_epoches: 0
caption_tag_dropout_rate: 0.0
caption_prefix: None
caption_suffix: None
color_aug: False
flip_aug: False
face_crop_aug_range: None
random_crop: False
token_warmup_min: 1,
token_warmup_step: 0,
is_reg: False
class_tokens: zkz
caption_extension: .txt